Camilla Newman, Brides publisher and numbers girl, says:
Base your budget around your venue as it's likely to be your largest outlay. It really determines your spend as venues often have a room hire fee and/or a charge per person.
Begin by making a rough guest list that gives you an idea of numbers, then search for your venue by capacity which will help gauge your price bracket.
My advice is don't stint on your dress or photographer, as it's these timeless images on your mantelpiece that will last the test of time.
Throughout the planning process, remember that once you're back from honeymoon, you won't want the credit card bills rolling in, so set your total and stick to it!