So……….
DCM change out done and trip data now current but missing between trips between mid August and now.
The new DCM did not fix the remote functionality issue. Now, I not only can’t lock/unlock, but I also can’t activate climate control remotely. Bizarrely, I can switch the warning lights on though.
Dealer has reopened the case with Toyota Europe tech support team.
TBH it’s all getting pretty tiresome, my car is now 20 months old and still not operating as per spec!