I got recommended by my tile supplier to one of their customers. He had B&Q fit a kitchen and tile walls and floors. To be fair the kitchen was fitted to a good
standard.
Anyway, tiler turns up provided by B&Q the first day, and off the customer goes to work. Tiles are from my supplier 60x30 rectified porcelain, £55m. He comes home from work to find a right mess. Tiler is chuffed to bits with job he's done, customer goes ape. Tiles have varying degrees of joint width ranging from 4mm to touching. The sill in the window is out of level by 15mm from front left to back right over a 1.5m width.
Upshot was that B&Q agree tiling was not good enough and paid for new tiles. Customer asked for a recommended tiler at the supplier and I got the job. Did the floor also and then 6 months later did his house bathroom for him with a £150 tip.
The sheds all use subbys so it's pot luck as to who you will get. You pays your money.........