Just laid some Wickes tile effect lam with underfloor heating and it expanded only about 2mm over about 3-4 metres, very stable. Although I hear its very sensitive to humidity or damp.

Only problem I have is where it meets a 2m wide patio door I cant find a suitable 2m strip which will allow expansion underneath it, like an upturned L section. Currently have a 10mm gap there! Any ideas?