Posted: 28/04/2015 at 10:37
It is illegal for anyone other than a gas safe registered engineer to carry out such a repair. Not to mention potentially lethal. Just imagine broken glass and aluminium shrapnel flying through your neighbours gardens. Don't even think about it.
Try one of your local central heating companies. The part required is almost certainly widely used in gas fires and central heating boilers and it should be easy and relatively cheap to fit, especially if you can take it to them to save a callout fee.