I suspect that the old style heating systems compared to the new may come close to matching the comparison of old style ICE Vs EV in terms of cost to benefit analysis..? Also the increase of complexity in the modern systems compared to the old, as Paul points out in his post, there can be reliability issues with cost implications relative to that additional complexity.

additional complexity..? From what little I know of modern systems your average plumber`s knowledge of such systems may also be similar to the average mechanic skilled enough to work on a Trad, then being faced with resolving digital related issues on an EV...? It seems that the KISS principal has been lost to the sands of time..?

I suspect insulation is the primary factor in any build relative to the long term heating costs, pity the govt ditched the grants, leaving it to those who could afford to modernise, be that home heating or motor transport related....Hmm..?.

All just part of the evolutionary processes and govt priorities..?