Most of the markets we map are services. This one is factories — the 314 UK plastics-products manufacturers that publish a full profit-and-loss, booking £10.5bn of combined turnover from injection moulding, extrusion and thermoforming. The map has one clean rule: the margin belongs to whoever owns the product, not whoever owns the biggest machines. At the very top, Marelli’s UK arm lost £8.1M turning out car parts on £528.6M of turnover for carmakers who set the price; a tier below, Floplast converts 17.6% of its drainage-fittings revenue into profit, and Aberdeen’s Balmoral Comtec grew 85% to £142.0M at a 24.3% margin riding the offshore-energy build-out. In between sits a deep, old, mostly profitable industrial mid-market that the national story about manufacturing decline says shouldn’t exist. Figures are approximate — verify against a company’s own accounts before relying on any single number.
Read the shelf first
Three things change how you read the numbers below.
Not everything on this shelf is a factory. Wayland Games (£213.6M) is one of the biggest names in the table, but it is a tabletop-games and miniatures retailer — 95 staff and roughly £2.2M of revenue per head is warehouse-and-webstore economics, not moulding-shop economics (a real plastics plant here runs at £150–350k per head). Versuni UK (£28.5M), the UK sales arm of a global home-appliance brand, is a distribution entity too. So, on a close read, is ICU Medical International (£188.4M): the UK arm of the US-listed infusion-devices group closed its UK factories in 2023 and now runs as a design-and-distribution business — a fifth of its turnover is services billed to group companies, nearly half its £33.7M pre-tax profit is interest on loans to the group, and the operating line is £18.1M (9.6%), not the 17.9% the headline implies. All three are excluded from every competitive read.
The automotive giants are UK arms of global groups. Marelli and Opmobility exist to supply volume car plants; their UK profit lines sit inside group transfer-pricing and customer contracts negotiated far above plant level. Read their margins as what a tier-one supplier is allowed to keep, not what the factory earns.
A handful of names blend distribution with manufacture — trade-counter businesses like General All Purpose Plastics resell alongside what they make, which flatters turnover and thins margin. Comparing their percentages against a pure product manufacturer overstates the gap.
The giants: the customer sets the margin
The top of this market sorts by end-market, and the end-market tells you the profit line before you read it. Fragmented customers (plumbers’ merchants, garden centres, hospitals) leave margin with the manufacturer; concentrated customers (carmakers, housebuilders) take it for themselves.
| Company | What it is | Turnover | PBT | Headcount | TO YoY |
|---|---|---|---|---|---|
| Marelli Automotive Systems UK | car-parts plants supplying volume carmakers | £528.6M | −£8.1M | 1,257 | +1% |
| Alpla UK | rigid packaging — bottles and caps, Austrian-owned | £306.0M | £27.0M | 890 | −1% |
| Specialist Building Products | PVC window, door and roofline systems | £283.0M | £19.6M | 1,866 | −7% |
| Opmobility Exterior UK | bumpers and body panels, French-owned tier-one | £249.9M | £18.6M | 944 | +7% |
| Wayland Games | tabletop-games retailer — not a factory, see above | £213.6M | −£1.7M | 95 | +9% |
| ICU Medical International | infusion devices — group design-and-distribution arm, see above | £188.4M | £33.7M | 308 | — |
| Eurocell Profiles | PVC window-profile extrusion | £181.2M | £14.1M | 798 | −3% |
| Reliance Worldwide (UK) | push-fit plumbing fittings, Australian-listed group | £179.3M | £18.9M | 843 | −4% |
| General All Purpose Plastics | building plastics, makes and resells | £157.6M | £2.5M | 987 | +6% |
| Zotefoams | listed technical-foams maker | £147.8M | £15.3M | 569 | +16% |
| Balmoral Comtec | subsea buoyancy and offshore-energy equipment | £142.0M | £34.4M | 388 | +85% |
| Keter UK | garden storage and furniture, Israeli-owned | £127.0M | £5.5M | 172 | +12% |
The most profitable company in the table — Balmoral Comtec (£34.4M on £142.0M) — banks more profit than any company above it, on barely a quarter of Marelli’s revenue, and its margin is genuine trading: it owns a specified product, buoyancy and protection hardware for offshore energy, in a market that has to have it. (ICU Medical’s £33.7M looks similar on the shelf but isn’t — see above.) At the other pole, the automotive and construction names are living their demand cycles in public: Marelli holds revenue flat while trimming heads (−2%), and the PVC building-products trio — Specialist Building Products (−7%), Eurocell Profiles (−3%), Reliance Worldwide (−4%) — are all shrinking with the housebuilding and RMI slowdown, cutting staff to defend perfectly respectable 7–11% margins while they wait for the cycle to turn.
The shape of the market
This is a mid-market industry in the strict sense: 260 of the 314 companies sit between £5M and £100M of turnover, and the small bands are nearly empty — below roughly £5M a moulding shop files small-company accounts and disappears from view, so the visible market starts at real factory scale. Profitability climbs steadily with size, from 71% of the £5–25M band to 91% of the £100M+ band — energy-hungry processes reward utilisation, and utilisation rewards scale. The squeeze of recent years (industrial electricity among the priciest in Europe, resin costs, a soft automotive and construction cycle) shows up not as a graveyard but as a compressed median: the typical manufacturer here keeps only around 4–5% of turnover as profit, which is why the double-digit exceptions below are worth naming.
| Turnover band | n | Profitable % |
|---|---|---|
| < £1M | 26 | 54% |
| £1–5M | 6 | 67% |
| £5–25M | 162 | 71% |
| £25–100M | 98 | 76% |
| £100M–1bn | 22 | 91% |
Where the money is: fittings, films and specified products
The best-run mid-market operators share a shape: they own a branded or specified product — something a plumber asks for by name, an engineer writes into a drawing, or a battery maker qualifies into a cell — sold into thousands of small customers rather than three big ones.
| Company | What it makes | Turnover | PBT | Margin | Headcount |
|---|---|---|---|---|---|
| JSP | safety helmets and PPE | £98.3M | £11.1M | 11.3% | 498 |
| Floplast | plumbing and drainage fittings | £93.4M | £16.4M | 17.6% | 356 |
| Renolit UK | technical films and sheet, German-owned | £83.7M | £8.1M | 9.7% | 335 |
| McAlpine & Company | plumbing traps and wastes, Glasgow, family-owned | £82.3M | £7.5M | 9.1% | 733 |
| Cubis Systems | underground access chambers and ducting | £74.4M | £11.7M | 15.7% | 391 |
| What More UK | Wham-brand storage boxes and housewares | £71.3M | £3.8M | 5.4% | 289 |
| CRP Subsea | subsea pipeline protection and buoyancy | £63.2M | £4.0M | 6.4% | 213 |
| Smithers-Oasis Europe | floral foam, US-owned | £62.1M | £4.6M | 7.4% | 366 |
| Emplas Window Systems | PVC window fabrication | £61.5M | £3.3M | 5.3% | 421 |
| Proampac Elsham | flexible packaging films | £59.0M | £12.0M | 20.4% | 128 |
…and ten more profitable operators between £43M and £61M, including The Millboard Company (composite decking, 11.1%), Carclo Technical Plastics (precision medical moulding, 13.9%), Intralox (conveyor belting, 13.5%), Craemer UK (plastic pallets, 10.7%), Entek International (battery-separator film, 9.3%) and NP Aerospace (ballistic protection, growing).
Look at where the double digits cluster: fittings and below-ground infrastructure (Floplast, Cubis, McAlpine), specified safety and medical products (JSP, Carclo), and packaging film with technical content (Proampac Elsham — £12.0M of profit from just 128 people in its latest filed year, the best profit-per-head in the table). None of them is glamorous; all of them are the default choice in their niche, and the customer base is too fragmented to squeeze them. Contrast the honest grinders on the same list — What More, Emplas, Hozelock at 5.3–5.4% — selling consumer and construction products into retailers and installers with real buying power.
Growth, read with care
| Company | Turnover | PBT | Margin | TO YoY | Staff YoY |
|---|---|---|---|---|---|
| Talisman Group | £16.5M | £929k | 5.6% | +98% | +78% |
| Balmoral Comtec | £142.0M | £34.4M | 24.3% | +85% | +27% |
| Westwood Pipelines | £17.2M | £1.3M | 7.5% | +47% | +15% |
| Superior Wellness | £37.1M | £721k | 1.9% | +46% | +32% |
| Shapers’ Technologies UK | £11.4M | −£37k | −0.3% | +40% | +11% |
| Talisman Group Crewkerne | £4.7M | £779k | 16.6% | +38% | +14% |
| Power Plastics | £18.4M | £2.4M | 13.1% | +34% | +14% |
| SPM Plastics U.K. | £19.4M | −£4.2M | −21.4% | +34% | +14% |
| Versuni UK | £28.5M | −£304k | −1.1% | +33% | +5% |
The one unambiguous growth story is Balmoral Comtec: +85% to £142.0M, a 24.3% margin, and headcount up 27% behind it — capacity being built to meet real offshore-energy demand, the same wave lifting CRP Subsea and Westwood Pipelines. So attractive, in fact, that Freudenberg, the German industrial group, bought the business from Sir Jim Milne’s Balmoral Group in May 2026. Elsewhere, read carefully. The two Talisman entities are parent and subsidiary growing in step — one business, not two. Superior Wellness is adding revenue at +46% but keeping just 1.9% of it — growth bought at close to breakeven — and SPM Plastics is the cautionary case: +34% turnover with a −21.4% margin, losing money faster the more it makes, exactly what winning work on price looks like in a business with expensive machines to feed. Versuni is the retail interloper again; its growth says nothing about manufacturing — and Wayland Games, whose previous year grew +34%, has since filed a year of +9% growth and a £1.7M pre-tax loss, which is exactly why the retail rows are fenced off from every manufacturing read.
Market structure: nobody owns this market
For a capital-intensive industry, plastics is strikingly unconsolidated: the top five companies hold just 14.8% of the mapped turnover, and it takes the top 100 to reach 72%. There is no national champion — the “giants” are UK arms of foreign groups plus a handful of listed mid-caps — and beneath them sits a long shelf of £5–100M independents.
| Share of mapped turnover | |
|---|---|
| Top 5 firms | 14.8% |
| Top 10 firms | 22.9% |
| Top 20 firms | 34.2% |
| Top 50 firms | 54.3% |
| Top 100 firms | 72.4% |
Old factories, split ownership
The vintage profile is among the oldest we’ve mapped: 135 of the 314 companies predate 1990, and just 18 were incorporated after 2016. Nobody builds a new moulding business from scratch any more — the machines, the tooling libraries and the customer qualifications take decades to accumulate, so entry happens by acquisition. Ownership splits almost exactly down the middle — 153 corporate-owned, 151 individual-owned — which means half this market is still family businesses of exactly the kind consolidators hunt; about 9% already carry a Holdings/Group/Bidco-style structure, the fingerprint of a buyout done or an exit being prepared.
What the map shows
- The product owner keeps the margin. Fittings, safety gear and specified components earn 11–24% (Floplast, Cubis, Proampac Elsham, Balmoral Comtec); capacity suppliers to carmakers and housebuilders keep low single digits or less.
- The biggest factory is the worst business here. Marelli’s UK arm lost £8.1M on £528.6M — a reminder that in tier-one automotive supply, scale is a customer’s weapon, not the supplier’s.
- Offshore energy is the one boom. Balmoral Comtec (+85%, 24.3% margin, hiring hard) and the subsea supply chain around it are the only part of this map growing fast and profitably at once — and the consolidators have already noticed: Freudenberg bought Balmoral Comtec in May 2026.
- Construction plastics is in open retreat — the PVC window-and-roofline names all shrank last year, cutting heads to defend margin while housebuilding and renovation demand stays soft.
- This is a healthier industry than the manufacturing-decline story allows — 260 companies at £5–100M, three-quarters profitable, most of them decades old; but the median keeps only ~4–5% of turnover, so energy and input costs decide who stays comfortable.
- It’s a consolidator’s map: flat concentration (top five: 14.8%), half the market family-owned, an ageing founder base, and entry only realistic by acquisition.
Methodology and caveats
This covers only the UK plastics-products manufacturers that publish a full profit-and-loss — 314 of a register of around 766, so the long tail of small moulding and fabrication shops filing abbreviated accounts is invisible here, and the £10.5bn total is a floor, not the industry. Businesses shelved with the manufacturers but economically retail or distribution (a games retailer, an appliance brand’s sales arm, a medical group’s design-and-distribution arm) are identified by name and excluded from competitive reads; business-type labels are directional. UK arms of global groups reflect transfer pricing and group recharges as well as trading, and a company blending distribution with manufacture isn’t margin-comparable with a pure manufacturer. Figures are approximate — verify against a company’s own accounts before relying on any single number. This is analysis, not financial advice.