Sadly the way the tax laws are set up means that large corporations can just stick two fingers up if they dont like the lie of the land and move elsewhere, and those with deep enough pockets can become non-doms and either move between their various homes every few months or live in a tax haven like Monaco, the Channel Islands or the Isle of Man.
The folks who are going to get NAILED (and I do mean nailed!) by Corbyn and his mob are those earning from £35k up to £200k per year and who are PAYE employees of a company. The big hitters in management can request relocations if they want them, but those a bit further down who cant will be taxed until the pips squeak and wont be able to do a damn thing about it.
All this talk of "tax the rich" is daft - Less than 10% of earners in the country earn more than £100k a year, and less than 4% earn over £150k. You cant just nail the rich, there arent that many of them as it is, and if you do wheres the incentive to do the stressful job? You might as well just stay doing the lower stress job and have a decent work/life balance!
And while I'm on my soapbox, £45k a year in the South East doesnt make you rich! Thats barely enough to afford a one bed apartment in most places, but the way the tax codes are set up you're a high rate payer because they set the rate way back when and then left it where it is. Fiscal creep ensured that more and more people fell into the high rate bracket - So even though there hasnt been a de jure tax increase theres been a de facto one as the rates are so far out of line with inflation its not even funny.
The only way Corbyn is going to get the tax laws back in favour of most families is to up the tax free limit at the bottom to around £20k, shift the 40% rate up to about £65k a year, scrap the removal of the tax free allowance over £100k a year and remove the 45% bracket over £150k. Oh, and bin inheritance tax because thats also well out of line with inflation and house prices. And then he's going to have to learn to cut his suit to the cloth he has in terms of government spending.
What he means though is "tax the nuts of everyone earning more than the average, increase the public sector hugely, bring back the unions and splash the cash". Cue brain drain, corporations leaving the UK and another winter of discontent a la 1978.