Assuming someone had moved house before, and put a new boiler in their new house, while remaining a customer of British Gas, I set about doing that.

It never occurred to me that I might be the first person on the planet to attempt such a thing. Not for a second did I imagine I was a swashbuckling pioneer to come up with the idea of ripping out an old boiler at the same time as continuing to buy gas, electricity and home servicing from an energy supply company.