ChatterBank2 mins ago
water tap
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For more on marking an answer as the "Best Answer", please visit our FAQ.It's surprising if the bath is on stored water and the basin next to it isn't. Youe can test where it is supplied from with a thumb (finger will be too small) used to stop the outlet when running. If it's mains pressure it will not be possible to block (sprays out sideways). I have seen this kind of problem caused by a disintegrated washer in the tap. This is easy to fix, but of course you have to find the stopcock or valve.
Afterthought ; if you turn off your main stopcock so that your kitchen taps stop, does the bath stop as well? If it doesn't, then it's on the stored cistern. Still shouldn't be too slow, though as it will be on big (22mm) pipe. Good luck
Usually your water supplier insists that at least one cold tap in the house is fed directly from the mains. It's usually the kitchen or bath room basin so's you can clean your teeth in or drink from this 'pure source'.
Like the man says it is a recent problem? If so then the advice about washers/blockages is good. Try and find your stop tap for this particular tap, isolate it and take the top of the tap to bits. If you can't find the stop tap then turn off the mains and drain your cold water tank until water stops coming from the bath tap. Stop draining and then take the top of the bath tap to bits. Be prepared, your washer might have disintegrated and the unions might leak when you reassemble. Have in hand a new washer, vaselene to lubricate moving parts, PTFE tape to seal threaded parts and a silicon sealant for any other parts which don't want to remain water tight.
Good luck