Any ideas how I remove this valve cover?

[Jpl]

hi, I have 1 radiator which won't warm up. Watched a few guides and think I have narrowed it down to the trv valve. Only problem is I can't get the valve cover off to check the pin. It's a myson valve if that helps, probably very old.
Any help would be appreciated and thank you

 

[snowhead]

Push the black spring clip to the left

 

[ShaunCorbs]

Give it a wiggle and pull should pop off

 

[Jpl]

Shaun you are awesome. Was worried to pull it too much before but a good wiggle and a bit of force sorted it. Pin was indeed stuck and thanks to you I now have a lovely hot radiator.
Absolute star

 

[Harvest Fields]

Shaun you are awesome. Was worried to pull it too much before but a good wiggle and a bit of force sorted it. Pin was indeed stuck and thanks to you I now have a lovely hot radiator.
Absolute star

Surprised it came off in one piece to be honest.

 

[SavageW]

Give it a wiggle and pull should pop off

Weren’t sure you was talking about removing the TRV head for a moment ​

 

[firemant]

have you decorated (blue & white) recently