Try Standards Doc 3 - Notes for the Guidance of Applicants taking the CPL Skill Test.
http://www.caa.co.uk/docs/33/SRG_FCL_03_A.PDF
a. The purpose of the flight
The purpose of the flight is for the applicant to demonstrate his ability to plan and conduct a Public Transport Flight (simulated) whilst acting as pilot-in-command and operating as a single crewmember.