Thanks, gentlemen.
I managed to get a camera behind the wiper motor today. It's apparently a Lucas 6W. Here's a photo.
Also, it looks like the vacuum switch part of the wiper switch is screwed on and was, in later years, replaced with a screwed on electric push switch. I have found one of the electric switches on eBay and will see if I can fit it in place of the vacuum one.
David
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