I am a TC Controller. I hate TK joiners and leavers at CPT. There are no procedures that really work and an aircraft calling for join or leaving CAS are an incident waiting to happen. I have seen loads of these near incidents and TC is just too busy to provide a radar service outside CAS.
Somebody has spent a lot of money in providing facilities at TK, they should have spent money so that those operators were safe joining and leaving CAS .
I think there should be one unit only proving a radar service in this area and it should be either VN or LF LARS