After my alternator problem of last week all is now well again.
Tracking down an alternator was a nightmare.
Basically I exhausted all known suppliers in an attempt to locate a replacement other than through Mini. All attempts failed with various alternators arriving which were clearly incorrect. One turned out to be a starter motor
In the end I had no alternative but to get one from Mini. Coopers in Maidstone fell over backwards to get one for me. I ordered it late Friday, they got in in for me this morning.
Fitting it was a big ish job with the air box coming out together with the TB and inlet manifold. Otherwise it was straight forward.
The price of the alternator was a mind blowing £340

The upside is that the new one is 110 amp whereas the old one was 100 amp. Apparently the 100 amp is no longer available.
After a refit of about 1.5 hours the car started up and was sweet as a nut.
I would like to extent a big thanks to Paul at Broad Oak Mini who posted the inlet manifold seals to me and also to Mark at Coopers for ordering the alternator.
Oh, and thanks to Richard at Coopers for putting up with my ranting this morning over the price of the alternator and being ripped of.