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You're allowed one single or double socket on a spur, total unfused spurs on the circuit should not exceed the number of normal sockets on the main circuit. You are allowed an unlimited amount of fused spurs.
It does say "a non-fused spur should feed only one single or one twin or multiple socket outlet or one item of permanently connected equipment" So you could bang on an outlet with more than 2 sockets provided it's a single unit.
If you need more, just put a fused connection unit on - but obviously you won't be able to draw more than 13a total from the sockets fed by the FCU.
How many sockets can you have on a spur. So far as I can see it's just one double socket, is that correct? Cheers