No one is ever going to support a government who can only think of taxing assets rather than massive income.
This seems daft really, as if a political party said categorically that “We’ll double taxes for the top earning 1%” - then the other 99% would potentially vote for that policy - Right?
Trouble is, that top 1% would all become non-doms, and you’d actually collect £0.00 in taxation, whilst already spending the presumably borrowed money in the meantime, soon running into a “Venuzuela” style situation. 
If Taxation is EVER to be reformed - it needs to be smashed up and re-built properly.
Me personally, - I would stop all the “Exceptions and exemptions”…
Everyone pays say, 15% tax on all income, no matter where it is from. If a third party gives you money for services rendered - then it gets taxed at 15%. Wages, Fees, Revenues.
If you sell an asset at a profit - you pay Capital Gains as before - on everything above and beyond £25k.
If you run a company, then the company can only claim expenses/offsets for those items direcly related to your business: Only someone in the Transport industry can get deductions for travel expenses. Only someone in the fitted kitchen/bathroom etc. industries can claim for a new fitted kitchen at taxpayer’s expense David Cameron please take note!
MPs pay the full 15%, and no expenses allowed under any circumstances. If you can’t afford to live frugally on an MPs seemingly meaty salary - then step aside, and let some other bugger have a go! 