I spoke to the tax office and various people before I left the UK - I was told that as long as I am non-resident and either claimed non-residency before I left or can prove non-residency you are not liable to pay tax for earnings. What you will pay tax on is from interest in a savings account - since the money is in the UK you are liable for tax on the interest. But you wouldn't have to pay tax just because you transfer your 'savings' back to the UK.