In article ,
"John Greenwood" writes:
But hang on, can I place a 20A switch in the ring circuit just like a FCU?

Yes, switching the spur (and not breaking the ring;-)
You have to have a fuse somewhere, be it in a FCU or in the
appliance plugtop, but you don't need more than one, and
it doesn't have to be at the beginning of the spur.

--
Andrew Gabriel