UPDATE
well, I guess it all learning with a new car. But after 6 hours on charge, my Caterham started and ran just as it used to!
Never had a car that would turn and fire but not run like this (apart from mk1 Golf with injector air leak problem)
I obviously need to investigate why the 12v apparent cig lighter is maybe discharging battery. It’s a new battery (I have previous owners invoice) and it was less than a week being not on trickle charger.
thanks for all your help this morning. You can imagine my total guttedness at car failing on my first blat. But I just managed a 20 min blat just now before the dark. These are just the best possible cars aren’t they? Even with the odd quirk. 😃
thanks again everyone