And in fact, just what shysters the gas industry / equipment manufacturers are - selling boilers for years now with 'hydrogen ready' stamped on them when there has been no concrete plan to roll out home hydrogen, and therefore no actual specification for the equipment that would be needed to connect to such a network. What may still happen is that the existing gas network will get a small amount of hydrogen blended in, which potentially has some small carbon impact - but that's just a small step on the way towards the demise of the gas network. And that will all have a significant cost - decommissioning a whole system - and at some point the reduction in the number of customers will likely force up bills for those remaining. At the moment it feels like that tipping point is decades away, but sometimes technology can shift quickly. The research that is now coming out on the health impacts of methane in the home might spur things on a bit.