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How can I remove the top of my British Gas TRV?

I have several radiators each with a British Gas TRV. One radiator remained on maximum even with the TRV set to 0. On replacing the top of the TRV it solved the problem.
How can I access the internal parts of the top unit.
Eric, September 2011
just unscrew the chrome ring at the base of the trv head.

Ian, September 2011
link Click here to see other fixes for British Gas TRV.