Thanks, will have a look. I was hoping someone might have managed to track down the part number. There are loads of solenoids (and end-plate repair kits) and its possible one would fit. If so, that would be a lot cheaper than sourcing from Germany.
I pulled the starter apart that I had previously removed from the car that often refused to work. Brushes etc all seemed fine. I even desoldered and removed the solenoid end-plate but the movable copper plate and fixed contacts were not too bad (though lovely and shiny now). There was a lot of corrosion to the nuts on the terminal posts so I wonder if that could have been the problem? Regardless, the one on the car refused to work for a couple of times last week (its been fine for 3 months) so I need to track this fault down. Hopefully, the "rebuilt" starter will be OK when swapped. I'd be happier to have a new solenoid to swap in though....
Keith