Range from the cheapest Fix a leak £240 (Plumbforce Direct Ltd based in W1U) to the dearest Fix a leak £380 (LUCO - London Utility Company based in W1W).
Comparing plumbers estimates for Fix a leak gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for fixing a leak in your home by posting your job to plumbers in John.