"John Greenwood" wrote in message
...
But hang on, can I place a 20A switch in the ring circuit just like a FCU?

snipped

You won't need any FCU in the circuit if you're making the socket in as part
of the ring main. If you're making the socket for the cooker hood a spur
off from the ring main in the kitchen, then a fused spur unit can be placed
beside the socket where you're taking the spur from. Then you take a single
cable up to the socket behind the cooker hood.

As long as the cooker hood can be completely isolated from the electric's,
both live and neutral, for maintenance reasons, then that is all that is
needed. This is why Andrew recommended either a double pole switch which
breaks both live and neutral supply, or a switched fused spur if you were
removing the plug.

A switched fused spur with flex outlet would be the neatest way, as this
means you're only taking one cable from the existing ring circuit, and
connecting the flex in to the switched fused spur, which is quite within the
regulations.