Nigel, I used to wonder, and even anticipated this. Australia is also pretty strict I think.

However, it hasn't happened, there's no sign it will so I think you might as well carry on and save money, get better insurance and not have to go to the MoT station.

All sorts of things could happen. If a miracle comes to pass and EVs stay there won't be much petrol at affordable prices. In the meantime I think: enjoy your cheaper to run classic and try not to anticipate politicians. Just look over the pond to see how mad they can be - no-one can anticipate what they'll do next so don't overthink it if you can manage not to.