Hey sss, welcome to the site.
I can say without a shadow of a doubt that The Master Tiling School in Hainult, Essex is where I trained 3 years ago. They had a fantastic setup, very informative, helpfull, understanding and look for a high qaulity of work.
They keep an eye on the guys coming through the school as they do look at giving guys work at the end of the course should the the quality of your work meet there standards.
I have worked for the on a few occasions, most recently on Heathrow Terminal 5 for 6 months and Stanstead Airport for 2 months.
If you contact the school, you can can go down there and take a look at the setup, get a feel for the place and talk to the guys already on the course to get there feedback before you decide to book anything....
Best of luck....