Well, on 'how many left', it shows about 200 Evora S (all versions - manual, auto, 2+0, 2+2) in the UK at present.
I got a little frustrated trying to find one as well. There are very few hitting the market and many seem to be sold by the time the adverts hit the internet.
I just bought one that was advertised on ph. It was for sale for a few months so grabbed a bargain I hope. Drives superbly I must say. I had a good run today with a Griffiths 500 and a Cerbera 4.5 v8 and I can say the Evora is not slow in this company.
They're certainly quick enough. I was a little color fussy when I bought mine which limited the choice further (don't think I got a bargain, was a bit too keen). Glad that you have one and are enjoying it!
I've heard numbers of around 2,000 for all Evora S1s (ie. Not the 400) - they never sold as many as they intended, thanks to a combination of factors. None of which were to do with the car, sadly.