Can't remove quarter turn tap head

[jamesheet49]

I can't remove the tap head for the cold quarter turn tap. The hot one comes off easily as it is not used much. How can I remove the cold tap head?

 

[Gasmk1]

Spray some wed 40 down the tap leave a while to work if still no success try pouring boiling water on it to heat it up then cool it quickly try a couple of times should do trick

 

[ShaunCorbs]

Pull and wiggle

 

[Ben-gee]

Brute force and ignorance.