#10 Mark W - thank you, that may prove very helpful. Cheers
#11 Er ... as in post #1, the car did 400 miles post-IVA.
It is also worthwhile spending the money to get an interface cable and use Easimap on a laptop to connect to the ECU, SBD are also a source of that cable (software is a free download from them, generally runs on Windows 10 these days):
if you did put in an unlocked ECU, the cable can also be used for mapping as well as monitoring and logging for the locked Caterham ECU.