Have you gone to bed yet, Secure?
If so, douglasb:
I am assuming that you have put the FCU on the ring - so the cables come in from one side and go out the other (or, you can insert it into the ring in that way). They might actually come down from the ceiling, or up from the floor, but there are two cables, the ring coming in and going out,
If so, you put a Dual Box in or on the wall in the same position - the left-hand cable goes into the left hand box and into the first accessory, then comes out (as in a ring) and goes into the right-hand box, and into the second accessory, where the right-hand ring cable is also connected. so it's like having two accessories on the ring, they just happen to be unusually close to each other.
In the Dual Box you can put any two accessories - single sockets, FCUs, switches, whatever you like, that you would normally put on a ring.
My preferred way of connecting kitchen appliances is to have a 20A DP switch with neon above the worktop, feeding an unswitched socket below the worktop where the appliance is plugged in with a 13A fused plug.