On Wed, 14 Feb 2018 09:26:50 +0000
Robert Hill wrote:

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.

Probably just condensation when the heat is off and someone has a bath
or shower.

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,

Is the chrome flaking off or just a bit porous? I'd give it a wipe over
with some very fine wire wool and a squirt of sewing machine oil or baby
oil, and see how it looked.