Well that took ages. It was 3C last night so I decided the garage heati= ng may soon be required for the parrots (I have it set to 5C on their th= ermostat). So I went to light the boiler's pilot light (which otherwise= uses =A310 a month of gas!), but it wouldn't light after trying for a f= ew minutes. I opened up the jet chamber, and the igniter was sparking f= ine and when holding the green button, I could hear gas, but not smell i= t. I can only assume there was a huge amount of air in the line. Why? = It is now lit after another 10 minutes of holding the green button.
P.S. the gas was off at the main lever in the meter box all summer.