Update.
I finally got hold of an auto electrician I used to use many years ago and have had the conversation with him regarding this problem. While he wouldn't rule out electrolysis, he also wouldn't rule it in until he has had a good look over the car and problem. I read him some of the comments from here and he has taken them all onboard, so thanks for your suggestions. He is going to try to make some time this week to head over to my house and have a look.
Will keep you posted.
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