In May 2014 I had a totally new bathroom refit - bought from and totally
fitted by B&Q.
A ladder radiator has started going rusty under the rungs - quite bad in
places. I don't know why - there has been no sign of radiator leaking: the
central heating system has not visibly been losing water or pressure.
I have contacted B&Q and they have told me I need to contact the manufacturer
of the radiator to see what they propose. On the B&Q web site it says the
radiator is guaranteed for 5 years.
On the t&c of my contract with B&Q - it says "These conditions do not affect
your statutory rights."

Suggestions on how to proceed please,