Maybe it is leaking a bit my bills are very high that's for sure. I can't smell anything though. Am moving house soon or would probably upgrade. Thanks again, Mark
Thanks for your quick responses. The pressure was 1.5bar and there was power to the unit. It all looked normal with pilot light on etc but the main burners were not kicking in. I read somewhere that it might be a blockage in the air pressure switch. Anyway to cut a long story short, I switched...