Funding is always the key to any restoration. In my 40+ years in aviation, that is the one fact that stands out. Money can make up for lack of parts and even ‘make up’ some lost time. The answer to almost any problem is – throw money at it!
For restoring any aircraft for a “Return to Flight” project,I would seriously consider reading both of these links.
The CAA have a strict set of regulations and these are available in PDF format which can be located on their website: