this was just for 2 straight walls not the window wall
small world the tiler has just rang me and knows and works with my son in law sometimes , who has his own plumbing and heating business, so that's made me feel better now, and mates ex hub going to give me all the adhesive, grout etc at cost price to help me out, hes going to try and pop in tonight or 2 moz to have a look, hes suggesting having my underfloor heating covered in latex too , ill wait and see what his price will be, he did say hes not the cheapest but does a good job, but he will do it a good price for me as only lives round corner and as a favour to mates ex who passes on quite a lot of work to him, he will help me out , he wants to choose the adhesive and grout he likes to work with, which I think someone else did mention, so fingers and toes all crossed