- Companies
- Plumbers and heating engineers
- Southport
- Mark Knowles Limited
Mark Knowles Limited
- Company number
- 07762785
- Incorporated
- 5 Sep 201115 years trading
- Registered office
- 60A Old Park Lane, Southport, Merseyside, PR9 7BG
- Nature of business
- Plumbing, heat and air-conditioning installation
Mark Knowles Limited is a 15-year-old private limited company registered in Southport, company number 07762785, one of 42 plumbing and heating companies in Southport. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £2,129 (+557.3%) on the year before, to £2,511.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £101K against £108K owed within a year: 0.9 times cover.
- 4 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £2,511 | £101K | £108K | 4 | |
| 31 Mar 2024 | £382 | £72K | £68K | 4 | |
| 31 Mar 2023 | -£3,877 | £80K | £63K | 5 | |
| 31 Mar 2022 | -£8,672 | £41K | £84K | £63K | 5 |
| 31 Mar 2021 | £7,092 | £124K | £139K | £93K | 4 |
| 31 Mar 2020 | £828 | £21K | £55K | £57K | 4 |
| 31 Mar 2019 | £22K | £9,045 | £74K | £53K | |
| 31 Mar 2018 | £1,271 | £11K | £60K | £60K | 3 |
| 31 Mar 2017 | £2,250 | £37K | £55K | £54K | 3 |
| 31 Mar 2016 | £1,420 | £18K | £46K | £47K |
Where Mark Knowles Limited is registered
The registered office is in Southport (PR9), in the Sefton local authority area, North West. Show PR9 7BG on a map.
Other trade companies in PR9
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- Desmo Engineering & Motorcycle Services LtdMotor traders
- Bird Building & Construction LtdBuilders
- Hit Happens Arc LimitedMechanics and garages
- Nja Construction Services LtdProperty developers
- Silverline Renovations LtdPlasterers
- Nestra Living LtdFinishing trades
- Churchtown Tree Surgery LimitedLandscapers and gardeners
What happens if Mark Knowles Limited files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 07762785
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 September 2011 (15 years ago)
- Registered office
- 60A Old Park Lane, Southport, Merseyside, PR9 7BG
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 5 September 2026
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Southport
Other active plumbing and heating companies registered in Southport.
- MH Trinity Services Ltd2014
- N.W.Bathroom Ltd2021
- Neil Aughton Limited2006
- R Whitfield Heating & Plumbing Services Ltd2002
- Redford Climate Solutions Ltd2026
- Silverstone Heating and Gas Limited2017
- Simpson Heating & Plumbing Ltd2009
- SMC Heating and Technical Gas Ltd2021
All plumbing and heating companies in Southport · All trades in Southport · Plumbers and heating engineers across the UK
Frequently asked questions
When are Mark Knowles Limited's accounts due?
Mark Knowles Limited's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Mark Knowles Limited's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Mark Knowles Limited still trading?
Mark Knowles Limited is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Mark Knowles Limited do?
Mark Knowles Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Mark Knowles Limited?
Mark Knowles Limited was incorporated on 5 September 2011, 15 years ago.
What is the penalty if Mark Knowles Limited files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Mark Knowles Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.