Thanks all an adjustable spanner and a bit more force than I was using sorted it. I was trying to unscrew the big one but decided it wasn’t that one… realise what it is now!! Sorry I don’t know about the earths??!
Hi I am trying to turn the water off under the bathroom sink with an isolation valve. My isolation valve seems to have 2 slots - which one is it - I don’t seem to be able to turn the small one but I’m sure the big one isn’t a valve anyway.. help!!