It is chargeable cos its 3rd party interference...
A BG engineer if ever i saw one. Straight out the mouth of a lincolnshire SM!! lol
ah i see haha, technically i supose so.... but can anyone really make a boiler "explode"??? (-insert hilarious exploding boiler situation-) it's a bit of a cop-out really. i supose how he defines "explode" is quite important.