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maybe make sure you know how to isolate the water supply to the house in the street before you go anywhere near it with mole grips just in case you make it worse.
i managed to snap the main supply pipe below the stopcock once by pushing the washing machine against it and had to shut off the water outside, but it probably took me a good ten minutes to get the cover off and stuff, during which time i had mains water pressure blasting into the kitchen and ruined the floor...
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The majority of that leak appears to be from the blue arrow tap body seal. Tightening that is unlikely to help.
The gland nut may be leaking slightly, but that would be evident between the spindle and rounded off nut. Red arrow.
With lead pipes, they could also end up leaking if you go swinging a wrench too hard. Also stopcock is likely to be old imperial sized if it goes pear shaped.
Got a leaky stopcock under the kitchen (oo-er) (vid attached).
Looks like the... gland nut(?) isn't a nut so much as a circle. Reckon some molegrips would do it to tighten? I've seen some YouTube answers say to pack under the gland nut with some PTFE tape.
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