Thanks for all the info and advice members.
Alternator connector clearly visible looks a sound connection.
Will have a good look at the (near) gear-box connection, once under-tray removed.
UPDATE:
Connection near gearbox was the fault.
Blue inner copper cable snapped but was being held together with it's outer blue insulation.
Blue inner copper cable started to crumble and disintergrate so cut cable back till reached a sound piece of cable, (about two inches).
Cut male connecter off and rejoined with fresh cable and crimped cable connecters and used (red) speaker spades onto/into female connecter, wrapped finished job in insulation tape.
Quite a simple effective job, once I had been advised by my fellow members.
Thank you all for taking interest and giving sound information..