Hi,
Upstairs radiator has started leaking slightly from the ftom the top of
the valve which switches it on and off (twist down for on up for off,
fairly basic stuff).


I am wondering what to do, I suppose I will have to buy as similar
valve, old one is compression about 14mm pipe?

Or is it just a washer?

Suppose I have to drain them by tying up the ballcock in the
hot water tank? Or is that just for the hot water?
Are the rads on a different circuit? Fairly standard setup
Glow worm boiler 25 years old ish.

Any help or advice appreciated.
Can't do anything now as it's too late at night,
I tried to stop the leak by tieing a bit off bicycle
innertube over the valvehead and binding it with string to
the pipe then tieing it up above the head but that didin't work well.
I also have some 'plastic padding' leak fix, stuff you mix and it sets in
ten mins, I guess I could have tried using some of that with the inner tube
thing?

Looks disconcertingly like one of these-

http://www.screwfix.com/prods/85665/...010&source=aw#