John Rumm wrote:
nospam wrote:


... currently got 8mm radiator pipes not sure about underfloor piping?


You may need to replace the lockshield valves as well depending on their
age and condition.

Also, while they're doing the installation I've asked for them to replace
the 12 radiator valves with thermostatic ones. How long is this likely to
take to do seeing as the system is bled anyway.


If all goes smothly, perhaps 10 mins / valve.

Not if the pipework's microbore. Devil's own spawn, that stuff :-(