Leaking bath tap help replacing ceramic disc

[Lucas87]

Hello all, I'm probably the worst handyman around. However I have decided to change the ceramic disc on my 1/4 turn tap as it's been leaking for a while now. I have managed to get the head off using an Allen key but there absolutely no budging the nut (possibly wrong term). I have a wrench but due to the access to the nut it makes it differcult to apply pressure whilst unscrewing. I have attach an image for you to see, questions is what tool do I need in order to unstressed the nut so I can replace the disc. I really dnt want to pay a plumbing £50 to unscrew one nut. But looks like the wife may make me!
Thanks in advance for the advice

 

[footprints]

A box spanner or a deep socket on a ratchet handle.
If you or a mate have socket sets for car maintenance you should find one to fit.

 

[Lucas87]

Top man thanks will buy some from screwfix this week

 

[gasbusters]

dont forget spray plenty of WD40 onto the nut thread, they can seize up over time. Also wear rubber gloves, you'd be surprised how a seized tap suddenly comes loose when you apply a lot of pressure only for your knuckles to hit the wall and remove a layer of skin! Good luck fella.

 

[Stadan20]

Just a tip mate there's a lot of ceramic discs /bodies out there