ISOLATED SYSTEMS LIMITED
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Cash
£4M
+3.7% highest in 4 filed years
Net assets
£6M
+5.4% highest in 4 filed years
Employees
53
+1.9% highest in 4 filed years
Profit before tax
£763K
+7.1% vs 2024
Net assets
4-year trend · vs Industrials median
Accounts
4-year trend · Δ = latest vs prior filed period · latest reflected 2025-05-31
| Metric | Trend | 2020-05-31 | 2021-05-31 | 2024-05-31 | 2025-05-31 | Δ vs prior |
|---|---|---|---|---|---|---|
| Turnover | — | — | £6,104,839 | £6,268,032 | +2.7% | |
| Operating profit | — | — | £639,891 | £636,702 | -0.5% | |
| Profit before tax | — | — | £712,484 | £762,852 | +7.1% | |
| Net profit | — | — | £716,622 | £559,149 | -22% | |
| Cash | £1,767,126 | £2,046,030 | £3,843,762 | £3,985,866 | +3.7% | |
| Total assets less current liabilities | £2,878,522 | £3,238,048 | £5,789,794 | £6,102,953 | +5.4% | |
| Net assets | £2,878,522 | £3,228,136 | £5,735,275 | £6,044,675 | +5.4% | |
| Equity | £2,878,522 | £3,228,136 | £5,735,275 | £6,044,675 | +5.4% | |
| Average employees | 48 | 49 | 52 | 53 | +1.9% | |
| Wages | — | — | £2,056,833 | £2,276,830 | +10.7% | |
| Directors' remuneration | — | — | £395,704 | £399,729 | +1% |
Values shown as filed in the company's annual accounts. — indicates the figure wasn't present under that line item in that period. The Δ column is the change from the prior filed period as a percentage of |prior|; lines a company doesn't report show —. About these numbers
Ratios
Computed from the line items above — sparklines read oldest → newest
| Ratio | Trend | 2020-05-31 | 2021-05-31 | 2024-05-31 | 2025-05-31 |
|---|---|---|---|---|---|
| Operating margin | — | — | 10.5% | 10.2% | |
| Net margin | — | — | 11.7% | 8.9% | |
| Return on capital employed | — | — | 11.1% | 10.4% | |
| Current ratio | — | — | 4.57x | 4.83x |
Margins divide P&L lines by turnover. Gearing is liabilities over total assets. Current ratio is current assets over creditors falling due within one year. Interest cover is operating profit over absolute finance costs. Sector-distribution context coming next.
Audit & accounting basis
- Accounting basis
- FRS 102
- Reporting scope
- Consolidated group
- Auditor
- TC Group
- Audit opinion
- Unqualified (clean)
- Going concern
- Affirmed
“The financial statements have been prepared on a going concern basis, under which it is assumed that the group will continue its operations for the foreseeable future. Management has assessed the group's ability to continue as a going concern and has concluded that, based on current financial position, operational performance, and future projections, there are no material uncertainties that cast significant doubt upon the group's ability to continue as a going concern for a period of at least twelve months from when the financial statements are authorised for issue.”
Group structure
- ISOLATED SYSTEMS LIMITED · parent
- MCL Unitex Limited 100%
Significant events
- “Sales for FY2024/25 improved slightly to £6.3m compared to 2023/24 results (£6.1m), producing a pre-tax profit of £763k. Profit for the year fell a little short of our projected target due to some extraordinary non-recurring costs.”
- “We experienced a growth in sales to OEM's in the HVAC and construction sectors that was complimented by a number of exceptional project successes, as we increased our presence in the commercial building services market.”
- “Sales to the Oil & Gas sector saw a drop during this period as project delays continued to impact the shipyards build programmes, however we did secure a couple of significant order's that will positively impact our business in 2026/27.”
- “Our order book is increasing for products related to the MOD sector, this is giving us the confidence to invest further resources into the evolutionary development of these systems, offering next generation technological acoustic and thermal performance advantages.”
Auditor, going-concern and subsidiary information is drawn from the narrative of the latest annual accounts. About these numbers
People
7 active · 3 resigned
| Name | Role | Appointed | Born | Nationality |
|---|---|---|---|---|
| COLEBROOK, Ann Irene | Secretary | — | — | British |
| COLEBROOK, Ann Irene | Director | — | Dec 1939 | British |
| COLEBROOK, David Arthur | Director | — | May 1941 | British |
| COLEBROOK, Gay Irene | Director | 2012-09-01 | May 1964 | English |
| COLEBROOK, John James | Director | 2012-09-01 | May 1971 | British |
| COLEBROOK, Nigel | Director | 2012-09-01 | Sep 1966 | British |
| PEET, Gary Edward | Director | 2008-06-01 | Nov 1972 | British |
Show 3 resigned officers
| Name | Role | Appointed | Resigned |
|---|---|---|---|
| HARRISON, Brian | Director | — | 1994-08-31 |
| KAY, Ian Charles | Director | 2003-12-17 | 2015-11-30 |
| WIDDOWSON, Ronald William | Director | — | 1995-12-01 |
Ownership
Persons with significant control
| Name | Kind | Nature of control | Notified | Status |
|---|---|---|---|---|
| Mr David Arthur Colebrook | Individual | Shares 50–75% | 2016-06-01 | Active |
Filing timeline
Last 20 of 113 total filings
| Date | Type | Category | Description | |
|---|---|---|---|---|
| 2026-03-04 | AA | accounts | Accounts with accounts type group | |
| 2025-07-29 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2025-03-03 | AA | accounts | Accounts with accounts type group | |
| 2024-06-26 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2024-02-29 | AA | accounts | Accounts with accounts type group | |
| 2023-06-30 | CS01 | confirmation-statement | Confirmation statement with updates | |
| 2023-02-27 | AA | accounts | Accounts with accounts type total exemption full | |
| 2022-06-17 | CS01 | confirmation-statement | Confirmation statement with updates | |
| 2022-02-24 | AA | accounts | Accounts with accounts type total exemption full | |
| 2021-06-25 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2021-04-19 | AA | accounts | Accounts with accounts type total exemption full | |
| 2020-06-15 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2020-02-25 | AA | accounts | Accounts with accounts type total exemption full | |
| 2019-06-03 | CS01 | confirmation-statement | Confirmation statement with updates | |
| 2019-05-24 | CH01 | officers | Change person director company with change date | |
| 2019-02-20 | AA | accounts | Accounts with accounts type total exemption full | |
| 2018-06-01 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2018-06-01 | CH01 | officers | Change person director company with change date | |
| 2018-01-25 | AA | accounts | Accounts with accounts type total exemption full | |
| 2017-06-02 | CS01 | confirmation-statement | Confirmation statement with updates |
Public-record activity
Raw counts from Companies House — last 12–24 months
- Filings
- 2
- Capital events
- 0
- Officers appointed
- 0
- Officers resigned
- 0
last 12 months
last 24 months
last 12 months
last 12 months
Direct counts from the register. No score, no rating — see the Filing timeline for the underlying events.