Indeed that was one of the "Loose bits"!!!!
Looked at the rear light connectors, and the outside pins of both sets were well corroded. Cleaned these and it works a treat!!!! Thanks so much for the help!!!
Will investigate the
pack, and keep you informed!
(We managed to find a 12mm(?) plug spanner, only prob was it diddnt fit down the recess!!! Had to grind it down to correct size!!! )