A part conclusion at least...
Caledonian Transmissions ran diagnostics on it and said they did not think it was a gearbox issue but a problem with the turbo.
Weeks later and the turbo actuator is replaced. The car runs much better. I still have what feels like a gearbox judder between 30 and 40 when accelerating, but this will have to wait for attention.
Thanks to all here and elsewhere for help with this!
Forty
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