Replacement of Bathroom Radiator Valves

JJforever

Hi All

I haven't had a 'new' quote yet but I was wondering how much would it approximately cost to replace both the valves on a radiator in the bathroom? I had this radiator installed only 6 years ago and it has been a problem ever since. When they installed it they did mention something about imperial pipes? The plumbing company who installed it sent out different plumbers to try and fix the leaks but there is still an issue. The guarantee ran out and I asked for a quote to replace the valves and was quoted over £300 incl VAT. I live in the London area. I have decided to get another plumber in. Don't know whether it's worth replacing the whole radiator as well, although I realise this will cost extra. I just want a radiator installed that doesn't leak. Also, do you need a particular radiator for the bathroom?

Any advice is welcome. Thank you in advance.

Here is the photo:-