Ideal Standard old pillar taps, how to remove cap

[fourtytwo]

Hi All,
I have inherited a couple of leaky Ideal Standard pillar taps that are not in there current catalogue. I am trying to remove the caps to gain access to change the washers or whatever is needed but cannot find out how to. I have tried levering upwards with a sharp screwdriver and twisting with gas pliers and a rag, nothing gives unless I am simply scared of trying hard enough ?
Any ideas welcome

 

[Deleted member 120897]

They look a little like non concussive taps, which but are you trying to remove? Looks like it should be the slightly dome shaped indice.

 

[snowhead]

I'd also guess that the outer plastic is retained under the internal screw and it's only the chrome cap that comes off, probably just push fit.

Wrap a cloth around the top of the tap and pour boiling water over it, the cloth will keep the heat on longer.
It should cause some expansion / contraction and may free the top up, however it's fixed.