Tried an adjustable spanner, pliers, spanners. They all hit the back of the switch before they fix onto the nut. I have a mate who is a plumber, I will see if he has pipe fitting pliers..
The new red one looks alot fatter than the one in at the moment. Will have to try and make it bigger away from the tubular part.
I thought it was leather.. well it looks it ! could be vinyl !!!