IMO the politicians should have done this properly, if we really are so badly done to, we should take a very hard look at "everything", by that I mean every penny that goes abroad, such as foreign aid, EU contributions etc.
I would have thought we should sort out our deficit before giving others money! The government keeps pedalling the line that for every £4 collected they spend £1 on interest payments. Of the remaining £3 how much is given away?
How much do we give the EU each year? Perhaps we could abstain from paying until the next election, how much could we save if we stopped handouts to other countries? Maybe we could then retain more of the services we need, that the current government seems to think we can do without.