You need to get a JAR CPL application form, fill it in with your breakdown of hours. Send it to the CAA with logbook and flight test certificate.
Don't forget to pay the usual extortion fee (I think its 170 pounds) for a new licence (thats on top of what you paid for your BCPL) - shout aloud "Rip me off again", and the CAA return to you another blue folder with the front cover saying JAA instead of CAA.
If you can't get through on the phone, try emailing FCLWEB, the last reply I got (last month) took 20 days !!! Good Luck.
Here in the states you turn up, get your licence issued straight away and you don't pay at all. Funny old world isn't it?