There are a few components that are connected here, the pilot light burner itself, the thermocouple and the gas valve. These all are gas or safety components of a gas appliance, my advice would be to contact your Gas Safe Registered engineer as these components should all be tested to make sure they fail safe. It is never possible to identify the actual one as they all work together.
Depending on the version of the BF 50 it is possible that an overheat interrupter could also be in operation, again this is a safety device and requires to be tested.
I would not recommend a DIY repair. At the moment the Uk weather has not significantly changed to cause the rush of appliances requested for service or repair, I would act now to find an engineer, beat the rush and be safe.
David Parker - Product Manager - Glow-worm
October 2009