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how can l fix my gas control valve?

My old glow-worm (25 years) gas control valve knob will not respond when the system is switched in. This has only just happened (last Fri 25 Nov 11). How can l fix it?
Dave, November 2011
Gas safe engineers job by law now to stop the incompetent from carrying out repairs leaving the system dangerous.

bb, December 2011
link Click here to see other fixes for Glow-Worm.