Thanks for the
help.....
Went to dealer and got new battery, lasted about 2 hours and then failed again, popped the key open and wiggled the contacts and now it's ok again... fingers crossed
Onto the tailgate, only bought the car Tuesday so was going to return to garage, but braved popping the tailgate trim and found a big lump of grease stopping the release mech from the handle to the lock. Cleaned and lubed and now all fine.
Just can't get the trim back in place in the dark, will try again tomorrow, any tips?