You'll stop the leak, but you'll also lose the ability to easily bleed the radiator. You can buy a replacement bleed valve for about £2. They're not hard to fit.

https://www.wonkeedonkeetools.co.uk/radiator-keys/how-to-fit-and-remove-blanking-plugs-and-bleed-plugs

Stop using your central heating to save the climate.

>>2607

Why? Do you want the climate to fall apart? Central heating is the only thing that can save us.

Odds on, it's just a bit of grot stuck in the valve. Arm yourself with a couple of cotton buds and a bit of kitchen roll - whip the screw out, scrub its pointy end with the kitchen roll. Wipe the mating surface inside the rad with a cotton bud.
You may want to depressurise the system first if you don't have a stinky water fetish,

I done it and it's stopped leaking. Up yours to all those who doubted me.