- Companies
- Machinery repair and installation
- Edinburgh
- Proton Power Limited
Proton Power Limited
- Company number
- SC562956
- Incorporated
- 10 Apr 20179 years trading
- Registered office
- 7 Wallyford Industrial Estate, Wallyford, Edinburgh, EH21 8QJ
- Nature of business
- Repair of machinery; Repair and maintenance of other transport equipment n.e.c.; Repair of other equipment
Proton Power Limited is a 9-year-old private limited company registered in Edinburgh, company number SC562956, one of 108 machinery repair and installation companies in Edinburgh. Its next accounts are due at Companies House on 31 March 2027, and the CT600 for the period to 30 June 2026 is due at HMRC on 30 June 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 £1,775 (+8.9%) on the year before, to £22K.
- Net assets rose in 5 of 7 year-on-year comparisons on record.
- Current assets of £172K against £150K owed within a year: 1.1 times cover.
- 5 employees on average, up from 0 the year before.
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2025 | £22K | £278 | £172K | £150K | 5 |
| 30 Jun 2024 | £20K | £441K | £421K | 0 | |
| 30 Jun 2023 | £16K | £374K | £358K | 0 | |
| 30 Jun 2022 | £8,610 | £250K | £241K | 0 | |
| 30 Jun 2021 | £23K | £93K | £68K | 1 | |
| 30 Jun 2020 | £2,925 | £58K | £60K | 1 | |
| 30 Jun 2019 | £6,238 | £3,978 | £5,857 | ||
| 30 Jun 2018 | £476 | £153 | £229 |
Where Proton Power Limited is registered
The registered office is in Edinburgh (EH21), in the East Lothian local authority area, Scotland. Show EH21 8QJ on a map.
Other trade companies in EH21
- Hilltown Projects LtdInstallers
- Johnny 191224 LimitedJoiners and carpenters
- Jrmacpherson LtdSpecialist contractors
- Authentic Autos Scotland LtdMotor traders
- The Benham Standard LtdCleaning companies
- S Little Installations LtdJoiners and carpenters
- Design Joinery Scotland LimitedJoiners and carpenters
- Lem Enterprises LtdMotor traders
What happens if Proton Power 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 March 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2027 to 30 Apr 2027 | £150 |
| 1 to 3 months late | 1 May 2027 to 30 Jun 2027 | £375 |
| 3 to 6 months late | 1 Jul 2027 to 30 Sep 2027 | £750 |
| More than 6 months late | From 1 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- SC562956
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 April 2017 (9 years ago)
- Registered office
- 7 Wallyford Industrial Estate, Wallyford, Edinburgh, EH21 8QJ
- Nature of business
- Repair of machinery (SIC 33120)
Repair and maintenance of other transport equipment n.e.c. (SIC 33170)
Repair of other equipment (SIC 33190) - Year end
- 30 June (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 7 January 2026
Filing notes for machinery repair and installation companies
Machinery repair and installation companies often carry parts stock and specialist tools, and many work on contracts that span the year end.
Similar companies in Edinburgh
Other active machinery repair and installation companies registered in Edinburgh.
- Prytec Limited1999
- Pump Action Limited1994
- R-Tech Offshore Ltd2019
- Richardson Services Ltd2025
- RS Coachworks Edinburgh Ltd2025
- Samasa UK Ltd2025
- SLS Aviation Ltd2026
- Sovereign Diamond Services Limited1990
All machinery repair and installation companies in Edinburgh · All trades in Edinburgh · Machinery repair and installation across the UK
Frequently asked questions
When are Proton Power Limited's accounts due?
Proton Power Limited's next accounts are due at Companies House by 31 March 2027 (in 169 days), covering the period to 30 June 2026.
When is Proton Power Limited's CT600 due?
The CT600 for the period to 30 June 2026 is due at HMRC by 30 June 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2027.
Is Proton Power Limited still trading?
Proton Power 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 Proton Power Limited do?
Proton Power Limited is registered under Repair of machinery (SIC 33120); Repair and maintenance of other transport equipment n.e.c. (SIC 33170); Repair of other equipment (SIC 33190).
How old is Proton Power Limited?
Proton Power Limited was incorporated on 10 April 2017, 9 years ago.
What is the penalty if Proton Power 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 Proton Power 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.