Quick question as I am not that experienced on S5 and I know it was quite different due to the boot arrangement.

I have an S2 and a Coupe (yes I know, greedy). And the S2 has no issues. The Coupe can be fussy. The breather has been adjusted a few times and had several recalls. Is you starting issue perhaps related to the tank not breathing and so pulling back once switched off. So the restart is a bit starved? Not claiming any skills in this area but I did have that hot start issue after one of the “improvements”.

Everyone loves a Morgan. Even me, unless it's broken again.