Have you spoken to your boss about your current package. £14k seems very low, especially for the job. is that a basic with massive commission on a sale, or is that inclusive?

Are you happy where you are? if you need more cash you could always do a couple of shifts in your local. Then you get paid to socialise with the regulars and your mates. Thats what I do (although my bar job has the benefit of being cash in hand)