Much like with a leak, a burst pipe needs immediate attention. The average cost to fix a burst pipe is around £180**. Obviously if this happens at the weekend you’ll have to factor in out of hours call-out fees too.
If your leak is coming from an underground water pipe, it’s likely to be more expensive to repair. If this is the case then you should contact your water company who may be able to help, depending on where the leak is coming from.