I have just had an excellent service from Colin Vincent, phone 01273 888547,based in Woodingdean and covers the local towns.
He had a slot on the day I phoned him and managed to trace and repair two small leaks. His charges are very reasonable and he was tidy. I found him on Checkatrade, http://www.checkatrade.com/VincentPlumbing/
Really pleased to have found him and have already arranged for him to come and do another small job.