Tax them if they ever visit again. We need the money.
That reminds me of a joke. I can't really remember how it goes but I'll try:
John, Terry, David, Liam and Alex go to the pub. At the end of the night they pick up the tab. The tab is $100.
John earns more money then anyone so he pays 50% or $50.
Terry and David both earn around the same so they pick up the tab of $20 each.
Liam is on minumum wage, stuck between jobs so he picks up the tab of $10 and Alex is on benefits and just had 3 babies so he doesn't pay anything.
After several times of this happening, John got fed up and said, you know what, I'm going to go to a pub with people who can afford to pay the same as I do. So John left.
Next time at the pub, Terry, David, Liam and Alex asked for the tab again. This time, since John was gone, Terry and David, to much of their disbelief, were forced to pay $40 each, while Liam who's on minimum wage had to pay $20, Alex again paid nothing as his chav girlfriend needed to buy tampons.
So Terry, David got annoyed and realized how John felt and left too. Next time at the pub, Liam paid the whole thing and never hanged out with Alex again, but that's okay because Alex and his wife are alcoholics so the government gives them extra money every 2 weeks to buy alcohol as long as they attend some pointless meeting once a month.
Moral of the story: If you drive the rich away, you're going to pick up the tab, the government isn't going to say oh okay, that's fine, no one needs to pay the taxes then. They are going to come up after you and everything you own and pretty soon you'll end up leaving as well and England will be left with nothing but the likes of Alex.