Roger Henshaw, their CGI, is a good man, and reputedly ran PPSC very well. Being on the same airport, but specialising in slightly different areas, we have a very friendly rivalry with GTS. Of course we think we are better (
I'm sure you would disagree, Roger
), but we can't yet offer distance learning so we are not competing for your business. I can say that the PPSC notes are good - one of the 4 sets I know of out their worth studying from.
Best of luck!