| Company | Timeline | Status | |
| Stratton Park Holdings Ltd Director • Civil Engineer | 1 Jan 2020←5 Years→Current | Active | |
| Pfa Ltd Director • Consulting Engineer | 13 Nov 2009←16 Years→Current | Active | |
| Peter Finlayson Associates Ltd Director • Consulting Engineer | 2 Apr 2002←23 Years→Current | Active | |
| Pfa Consulting Ltd Director • Consulting Engineer | 3 Nov 1999←20 Years→31 Dec 2019 | Active | |
| Stratton Park Ltd Director • Chartered Civil Engineer | 1 May 1991←34 Years→Current | Active | |
