Not sure where you're getting the 70 hours PIC requirement from to commence CPL.
Quote from LASORS:
Training Requirements
The holder of a PPL(A) issued in accordance with ICAO
Annex 1 (excluding the NPPL) with at least 150 hours
flight time as a pilot, may commence an approved JAR
CPL(A) Modular Course consisting of 25 hours dual flight
instruction including 10 hours of instrument instruction
(up to 5 hours may be instrument ground time in a BITD
or a FNPT I or II or a flight simulator). At least 5 hours
of the flight instruction shall be carried out in a complex
aeroplane (certificated for the carriage of at least four
persons and have a variable pitch propeller and retractable
landing gear).
Only mentions needing 150 hours total time to start the course, and 100 hours PIC for licence issue.
Also note:
An applicant who does not already hold a Night
Qualification/Rating (Aeroplane) shall be given
additionally at least 5 hours night flight instruction.