Selgas
Here is a simple solution to your problem – get your head down and look at the pilot burner when it going – is it burning a clean blue in colour or does it have some slight yellow tipping – I suspect it will be the latter which requires a gas serviceperson to resolve for you. Either way the problem is only minor and you should not be up for big bucks for the repair job. 
Selgas Services Ltd
Craftsman Gasfitters, Plumbers, Electrical Service Technicians
