You re forgetting the new EPC C requirement in 2030 & its not based on the current EPC guidance but on negatively scoring gas in favour of electric heating, be that all electric from the grid, solar and or a heat pump.
This is serious money for LLs to find, the ones in my village i know, with 1 BTL as their pension and long term tenants being charged 60 or 70% of market rent, are all planning to sell in the near future, the houses will be bought as 2nd homes and/or Air BnBs, as thats what happens to most houses sold down here.