Tray in 1/2 a day, tile 1 day, grout and tidy 1/2 day. Total 2 days, £400. Grout no more than a tenner, first fix pipework no more than £40. As long as you supply all materials youve said (including tile adhesive) and THEY ARE ALL ON SITE! (nothing will grind a trademans goat more than not...