Help! Wickes undertile warmer has stopped working....

About 18 months ago I installed Wickes undertile warmer in the kitchen.
I installed two kits to cover the area. It has been working great. Just
this week one of the kits has stopped working. Obviously I don't want
to have to rip up the whole lot. Does anyone know of a person near

For whole rooms, as their primary source of heat? Yeah, it'd be a bad idea.
But underfloor radiant heat using liquid tends to be a lot more reliable.

For me, reliability ain't the issue - I just really dislike UFH! AFAIK
this view isn't unique, 'though there are people who really, really like
it. I hope it's not simply radiant heat, though, I've an idea that'd set
fire to my slippers!

For a simple bathroom underfloor mats work well enough, provided they're
installed properly.

Enfield (Nth. London) who could come and fix it. I doubt the cable is
damaged but we are at the limit of my knowledge on this. Any advice
(other than ringing Wickes Technical Helpline ) would be appreciated.