WHICH TYPE OF COURSE IS BEST AND WHICH TRAINING CENTRE IS THE BEST IN THE u.K . ALSO IS A CITY & GUILDS QUALIFICATION NESCESARY I ALREADY KNOW HOW TO DRYLINE AND PLASTER IS THERE ANY THING ELSE THAT A PROFESSIONAL TILER ALSO NEEDS TO KNOW ,TO BE ABLE TO EARN A GOOD LIVING FROM THIS TRADE. :?