Update 19 June 2020

Continued to check electrical connections around battery. Noted the following:

The "front" controller - ABS I think - behind the battery was loose. Nuts that secure had not been tightened. Was this my fault? Possible. Would it cause any problems in earthing the unit? Is this a clue? I really don't think so but now we're in "desperation" territory so anything is considered.

The positive lead from the battery leads to a junction with numerous connection. They looked a bit corroded so were removed, Dremeled clean, copper greased and reinstalled.

Nothing else of an electrical nature looked suspicious so did general clean-up and reinstalled battery etc.

A new alternator and starter motor (both 30 years old) are on order and the local garage is on alert for installation when they arrive.

I'm trying to source a spare EZL of the following types:

A0125452032 (Bosch 0227400738

A0125452132 (Siemens EZ0051 5WK6 K30575HR1

A0105459532 (Bosch: 0027 400 736).

A0105459632 (Siemens: 5WK 301, I think)

PLEASE DOES ANYONE HAVE ONE OF THESE?

As always, thanks in advance for any comments, suggestions, EZLs!

Best to all.

RayH