Phoned Dave from Down the Drain on Tuesday evening; asked for him to come at 07:30 on Wednesday - by 07:45 the blockage was clear and he was back at 07:30 on Thursday to do a permanent repair to the very dodgy antique plumbing that had caused the problem. Friendly, efficient, and done for less than the call out charge of some of the bigger firms. All in all - excellent service!