Yes it does help
Thank al for the comments
I am surprised by the battery size, which looks small. I didn t check the Amp but would guess it is of similar size to the Banner in my Caterham CSR. So I tought it could be an under dimensioned battery issue
So my starting point was that it might be a case of TADTS
I will take the multimeter out tomorrow and give it a look.
The car is due for maintenance early Jan, but if the problem is an easy fix, I will sort it as I am hols during the next weeks and would like to drive the thing!
Thanks again