To backtrack a bit
Some businesses may leave the country because of Brexit, because they need to be in an EU country, that doesn't mean we should increase corporation tax in order to drive other businesses out!
As we have one of the lowest rates of corporation tax in Europe and the proposed Labour increases wouldn't make it the highest where do you think all these businesses would relocate to?
(I say Europe not because I'm thinking of the EU but because it is close to the UK, businesses aren't going to move far if they can help it)
Amazing that businesses leaving the UK because of Brexit is acceptable to our gung ho Brexiteers but asking them to pay their fair share of tax isn't. Clearly they approve of the tory vision of tax haven UK where, desperate to hang on to what we've got left, the ordinary taxpayer will pay more (because tax income has to come from somewhere) so as to subsidise the low tax bribes to business.