replacing washer on toilet inlet valve

[planetf1]

I have an inlet valve that is allowing some water in even when the float is raised. I wanted to check the washer - presumably diaphragm, but after taking off the cap, I'm unsure how to dismantle the valve. Any tips?
The inlet came with a NUCA C211 valve.
The other option is to remove/replace the inlet, but I'd hoped a washer would do the trick (less waste, easier!)

 

[ShaunCorbs]

Have to turn the handle part anti-clockwise with the water off to the Cistern and hold the bottom body

 

[planetf1]

Do they tend to rotate either way, or only one way (anti clockwise). No space to twist anti clockwise due to location in the cistern (otherwise it will be time to totally remove)?

 

[ShaunCorbs]

Needs to go anti clockwise as there’s stops by the looks of it

 

[planetf1]

Needs to go anti clockwise as there’s stops by the looks of it

Got it! Yes I'd missed the lugs. Had to remove the arm due to position, but now have access to the washer! Thanks for the advice!