What you have quoted there is the details from what old Beag's mentioned. The old CAA CPL had an embedded IMC rating that was valid as long as the CPL was. Now days, with the advent of JAR, there is no IMC rating included in the CPL. Period. And before you ask, you cannot do a CAA CPL any more. All licences issued are JAR. However, if you hold a valid Mutil Crew IR, you do get an implied IMC rating as long as the multi crew IR is valid.