I find it incredible you managed to get through a JAA CPL without knowing how to log flight time but anyhow....
Section Page 44 of
LASORS 2008 Documents | Personnel Licensing | Safety Regulation applies with regarding to logging of flight time.
In order to convert the CPL i need a min of 100 P1 hours.
Yes true for the CPL licence issue not for the ME(P) which some people get confused about.
If you are talking about the ME(P) conversion Section F of LASORS states that if you hold an ICAO rating equivilant you can complete training at the discretion of the head of training.
To me it appears that you haven't read any of the UK regulations - which I think would be a good place to start read from
LASORS 2008 Documents | Personnel Licensing | Safety Regulation especially since it's your responsibility to comply with them at licence issue.
- Section A Page 44
- Section D1.2(D) for Commerical
- Section E for the instrument rating requirements
- Section F for the multi Engine