These taps have me stumped!

[Banjaxed]

I need to disassemble this tap to repair the valves. But for the life of me I can't work out how to take off the knob caps! No grub screw, the top can't be prised off, it doesn't unscrew...
Anyone got any ideas? Thanks!

 

[townfanjon]

I think they screw off
Edit .. the caps lol

 

[snowhead]

I'm sure I've done some like those before.
The shiney part on the top of the tap head unscrews.
They'll be glued on with soap and other such substances.

 

[Ben-gee]

Are you down in Dorset? I changed a shower pump in a bathroom last night and that appears to be the basin they had!?

Like snowhead I think the final domed cover unscrews to reveal the valve.

 

[Banjaxed]

Thanks All! We have several of these taps and I managed to find one that would unscrew (see photo). So, I've ordered a strap wrench and will hopefully be able to remove the other covers too. Your help is much appreciated! Thanks!