Having had bad experiences with plumbers in the past - and blocked radiators downstairs for 2 years - I wasn't holding my breath when I asked PCP to investigate. Lots of costly "solutions" had been suggested in the past by previous people all with no result, but after a couple of attempts to unblock the problem it was decided they needed to be re-plumbed. Being a girl about it, I was worried about pipes all out on show, but they have done a brilliant job! Pipes were all put in around skirting board level, or hidden in the cupboard under stair's where possible. Really happy with the way it's been sorted out, and immensely happy to have heat downstairs again. I now have a plumber I can call again if need be. Thank you very much!