Fallen Eagle, it seems that some of the good bits of JAR-FCL have passed you by. As Noggin says, there's no difference now between keeping a PPL current and keeping a CPL current. When you say your licence expires what exactly do you mean? Is it 10 years old? Have you not flown for ages?
If you can't get an answer from Gatwick just track down a Flight Examiner (either a CAA one at a Test Centre or an industry one at almost any commercial school) and pick their brains.