I just thought I'd add my ten pence worth to this thread...
I have literally just completed an SEP Class Rating course and Skills Test at York Flying School, Breighton.
I picked York Flying School, as like others have said, it is run by knowledgeable, friendly, passionate instructors and examiners and at a very interesting airfield. The bonus to top it all is the very competitive prices. Also, a few months ago, long before I was a student of the school, Mickey Kaye (CFI) was most helpful in advising me of the best way forwards with converting my NPPL(A) SLMG to an EASA PPL(A) TMG with the end objective being a PPL(A) with both TMG and SEP Class rating.
They not only have instructors and aircraft available 7 days a week, but ALSO examiners. As I wanted to fly midweek rather than weekends due to family and work commitments, this suited me very well.
As with many people, once I was deemed ready for test by my instructor, I did not want to wait around for weeks on end for an examiner and weather to come together, so was very impressed to be tested within a few days.
I have enjoyed the course and look forward to now hiring aircraft from them once the CAA have processed my application.