OK soundHonestly, it makes little difference.
pick any and it will work fine.
OK sound think I go for a wireless one then. Its for a rented property the landlord might be a skin flint.If a brand new stat is needed with new wiring there are wireless units too that can save hassle.
I'm going round to look 3pm. See what the crack is.is the wiring to the stat. in place or will it be new? some stats only need T/E but some need 3 core/E.