Dave, do your own leak test – shut off your internal stop tap, if the meter continues to go up (give it a few minutes) then you have a leak between the mater and your internal stop tap, if you're in rented property then get straight on to the landlord, if not get on to your water supplier, they may be able to help, I know we do, but some companies are more helpful than others!
Edit – Your water supplier might come out and undertake a meter test for you, but be warned they will most likely charge for this, especially if the meter proves not to be innacurate (its one of the few services that they can actually charge you for on top of your water/sewerage charges)
Mrs Momo and I live in a 2 bed flat, both have showers everyday, no garden watering/car washing etc and our consumption is around 70 cubic metres per annum