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SamuelRSmith said:
...

 and allowing for changes based on what people do and don't do, then there Inland Revenue costs will start climbing again.

That is the key thing, yes. I believe (and can't prove) that the differences in lifestyle would cancel out for nearly everyone, and the benefit of making tax simpler and harder to avoid would be far greater. So no allowing for changes would be needed.

I don't believe it is the function of government to be encouraging and discouraging specific behaviour (fuel use, importing, varying VAT on items) with taxes. The market-set price should, under capitalism, be the actual price.