It may well have changed but I seem to recall that the CAA had to make a decision that flight time in an EASA aircraft counted towards the UK -specific licences.
What the CAA couldn't state was that flight time in non-EASA aircraft (Annexe II/Permit) would count towards the EASA requirements. That was something for EASA to agree. Remember they only have competence(!) over the types on their list.
Someone please tell me I'm wrong cos it certainly sounds a lot of rubbish