Thanks for the quick replies. Unable to trace source last night other than the flow is gravity fed. I must add that the flow is NOT a drip but a slow constant feed.
ChrisOxford it was my intention to use flexible connectors with built in iosolating valves rather than a straight isolating valve...
I'm a confident DIYer & in the process of updating the bathroom & therefore changing all fitments. They have all been removed. However during the process of removing the bath I went through the following process.
1. Main house stopcock turned off
2. Both red stopcocks on the hot water tank...