The Parliament in Westminster would regain the sovereignty that Gordon Brown signed away via the backdoor, so our elected politicians would get more work to stick their teeth into (instead of mostly rubber-stamping crap foisted on them from Brussels).
Council Taxes would fall by around 60% according to Daniel Hannan MEP, as we'd no longer have to fork out £10-14billion a year subscribing to EU membership...... basically every year we're forking out a sum equivalent to what it cost to build the Channel Tunnel to be part of the EU.
Food prices would drop by 17%, as the Common Agricultural Policy + Common Fisheries Policy jack-up food bills by £1200 a year.
Our sea fishing industry might regain strength again, as it's apparently losing £3.5billion a year from having it's time allowed out + grounds restricted by the Common Fisheries policy.
We'd likely see British businesses grow as EU regulations would be able to be ditched..... that apparently holds us back by around £200billion a year, and there were 100,000 pages of the damn things introduced from 1997 - 2010.
Communities will become safer, as we'd have a way easier time booting out some of the more questionable immigrants we currently have a hell of a job getting shot of (e.g. Eastern European rapists, etc).
The price of non-food goods would also fall, as we'd be able to negotiate foreign trade deals on our own terms, with protection via World Trade Organisation rules..... for which we'd regain a seat at, which we don't have with EU membership.
Defence would be unaffected as that's all traditionally done through NATO anyway.