Thank you, Jim. Found this an ebay:
https://www.ebay.co.uk/itm/133181881801?ssPageName=STRK:MEBIDX:IT&var=432528221334&_trksid=p2060353.m2749.l2649
order placed. Tomorrow, will have a look whether I can make a jury rig, but not pinning too much hope. Always feel the battery earth is about the most vital connection in the wiring. In fact on one forum, https://thelonelyones.co.uk/ if anybody ever mentioned any electrical problem, there was one correspondent always said, 'Check the battery earth - nearly all electrical faults are a bad earth.'
Edit - Grimly, we crossed - the one on order ought to do what it's sold for?
https://www.ebay.co.uk/itm/133181881801?ssPageName=STRK:MEBIDX:IT&var=432528221334&_trksid=p2060353.m2749.l2649
order placed. Tomorrow, will have a look whether I can make a jury rig, but not pinning too much hope. Always feel the battery earth is about the most vital connection in the wiring. In fact on one forum, https://thelonelyones.co.uk/ if anybody ever mentioned any electrical problem, there was one correspondent always said, 'Check the battery earth - nearly all electrical faults are a bad earth.'
Edit - Grimly, we crossed - the one on order ought to do what it's sold for?