2010 I took over a business property with British Gas already supplying electricity, got the welcome pack from them but no bills for 6 months then their agent forced entry to disconnect on previous tenants debt. Had to pay connection deposit £500 and previous tenants debt meanwhile no heating so plumbing burst. I made a formal complaint which they still have not dealt with. 2011 86 year old, lone parent's house with a British Gas boiler cover agreement, I discovered that British Gas had not been servicing the boiler although paid to do so, opened boiler front panel to discover year old condemnation notice but boiler left working! They came out same day and serviced the boiler. My opinion: British Gas can wreck your world.