Ok, so if I follow devonspark suggestion, I would have a 10mm from the ccu and 2 x 6mm (1 for hob and 1 for spur to feed hob) . I am told I can de rate the CPD to a 40 A. So im still left trying to get 1 x 10.0mm and 2 x 6.0mm in a connection unit, will they fit .