As Mr Plod at STN 72-73 I remember these a/c very well. Apart from the resident ones we also had the Conrot Super Guppy which if I recall was N reg. There was a regular CL44 sporting the Swiss flag and HB reg. I also recall one that used to come from S America with blood stock.
Finally there was a derelict 44 parked up from TMAC's hangars and one day a wooden rig was built and the a/c lifted on to this craddle by crane . Over the next six months it was rebuilt and took flight again. Happy days.