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Angled radiator valves?

In a house 8 radiators

What is a fair price £'s to pay a gas safe engineer to changing the angled radiator valves using bog standard plastic turn knob chrome body on/off valves not the thermostat type.
Many thanks.
Bob, October 2011
It is a DIY job,or get a quote from a PLUMBER,I would DIY,parts are cheap.

Rich, October 2011
don't need to be gas safe to change radiator valves

Rob, October 2011