Hi Gary, contact the British Rotorcraft Association rather than the CAA.
The assertion that it can be flown legally outside the UK, is probably
relying on it being given a permit by some other national authority,
which is fairly unlikely.
The registration probably remains valid whether it has a permit or not.
You might get the support of the B.R.A. on this if it was presented as
a restoration of a project that predated Section T.
It might be considered to be ' of historical significance ' in the British
rotorcraft community.
Getting a machine-type through section T is time-consuming and expensive,
so unless you have a lot of spare sheckles floating about to pay for
professional stress analysis, I would forget it.
It is also likely that the machine configuration as it stands would not
satisfy current pitch-stability requirements, hence more mods etc.,
Whether it would be a good aircraft or not I couldnt say, but the Wombat
pod was designed for a jockey, so it may be similar.
If you have any long beaches in Stornoway, you could have fun crow-hopping it.
cheers.