Might be better if you keep half the money here half there? Whatever works for you and is most tax efficient. If you leave the UK make sure you also claim back any tax paid in the last 5 years. Talk to your accountant about this one, might get a nice lump sum cash but the catch is that you cannot return to the UK as a resident EVER!
Might be worth talking to your accountant about this, could end up making quite a substantial saving moving money around.