| Company | Timeline | Status | |
| Argyll Energy Solutions Ltd Director • Company Director | 12 Jul 2019←6 Years→Current | Active | |
| Ol Construction Ltd Director • Managing Director | 15 Dec 2017←1 Year 10 Months→25 Oct 2019 | Dissolved | |
| Global Hybrid Roofing Solutions (North Installations) Limited Director • Director | 12 May 2009←16 Years→1 Aug 2025 | Active | |
| RHH Scotland Limited Director • Director | 24 May 2006←19 Years→Current | Active | |
| MPMH Construction Limited Director • Brick Layer | 16 Jun 2004←20 Years→6 Jun 2025 | Active | |
| Decorall Limited Director • Director | 5 Aug 1996←4 Years→18 Jan 2001 | Active | |
David H Allan (Joiners & Building Contractors) Limited Director • Company Director | 17 Aug 1994←6 Years→18 Jan 2001 | Dissolved | |
McArthur Bros. Limited Director • Company Director | 10 Jan 1994←7 Years→18 Jan 2001 | Dissolved | |
| David H Allan Group Limited Director • Unreported | 28 Sep 1990←10 Years→18 Jan 2001 | Active | |
