Yet there are apparantly a number of CAA registered aircraft restored in the UK away from their own constructed serial number configurations?
As I understand it there are modifications of low back Spitfires to high back, and single seat spitfires to dual seat, not just simply through fitment of a jump seat in place of redundant military radios or fuel tanks to maintain the same C of G balance, but creation a full rear cockpit and relocation of the existing cockpit forward in line with the TR9 design, all at odds with how those particular serial numbered airframes rolled out of the factory?
Yet these seemly run the gauntlet of the CAA and survive the experience?
The modification to the Spitfire is covered by a contemporary Vickers- Supermarine modification. So you can build your Spitfire and providing the modification is effective for that mark you can apply to the CAA to embody the modification (via a form and a large cheque).
Regarding the Blenheim, if there is no existing mod, then you would contract a design organisation, with the appropriate approvals, to draw one up. As I pointed out in my post above, these are getting few and far between.
It is important not to confuse aircraft that were ‘restored’ to the original type design standard and subsequently modified, with aircraft that are produced as facsimiles of the originals, e.g. with different engines, structures, systems etc.
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