On Fri, 12 Sep 2008 14:50:11 GMT, Stephen
wrote:

I was going to run 15mm pipe to the radiator but switch to 10 mm to
run behind the skirting board for the last metre. Can you see any
problems with this? By using just a short length would that avoid any
problems?

I did late parents in laws house many moons ago using two 15mm long
pipes under the landing and downstairs floor which had enough room
underneath to do it all from below) as an extended manifold and taking
off 10mm feeds at intervals to feed the radiators. The longest 10mm
feeds were about 15ft. It worked for 20 years at least without any
problems at all.

Is there such a thing as microbore lagging? I haven't seen any at any
plumbers' merchants.

Air conditioning companies use it. eg
http://www.ryanairconspares.com/10mm...ing-p-525.html