Domestic ring main is limited to the area of the floor ie 100 square metres not 100 metre length, you can have unlimited sockets on it as long as the floor area is less than 100 square metres. And one spur of each socket or fcu.
Length will be limited by volt drop and Z's, I'll focus on volt drop here, because without knowing the Ze and the type and rating of protective device, I can't comment on Z's
There is an allowed volt drop of 9.2v (4%) 2.5mm² T&E drops 14mv per amp per metre:
9.2v / 0.014v = 657
657 / 32A = 20.5
20.5 x 4 (due to the ring nature of the circuit) = 82m
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