The points on this are - some of the top 1% are paying high rates of tax and some are avoiding it so it makes sense to make sure the top 1% are treated fairly compared to the others in that category.
The word "avoidance" has last all meaning. Whilst originally a common law concept, HMRC have an entire manual on domicile and Parliament has enacted endless law on it. It exists in its current form to attract non-UK national investors to the UK and is absolutely not avoidance.
Some people pretend to live on other countries - that is a loophole that needs closing.
Who does and how do they do this?
The other point is that saying that the top 1% pay 25% of taxes gives you a pretty good indication of how unbalance income is in this country and that the 99% would be right to question the validity of that situation.
this makes no sense. First of all if it is income earned "in this country" it will be taxable regardless of domicile. Second a more equal income distribution would reduce the tax yield due to the impact of marginal tax rates. Third it is the whole point of a progressive tax system.
i personally don't understand the obsession with relative inequality, particularly between the top 1% and! say, the top 50%. I would prioritise alleviating absolute poverty and increasing the consumption power of the lowest 25% of earners personally.