This turned out to be a faulty TCU.
A secondhand one has fixed the problem completely.
For info, my car was stored for about 18 months outside in Scotland, but it ran fine for 6 months this year after coming out of storage and shipping to Bulgaria..
The fault appeared out of the blue and became harder as time went by, putting the box into limp mode nearly every journey, but not 100% of the time.
In the end about one start in forty didn't result in limp mode, but the rest did.
I guess it was condensation inside the TCU while it was stored that was at the root of the problem.
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