Way back in 1978 when I left the RAF I went on to the North Sea on to the As330J. That was an upgraded Puma with plastic blades. The Air Force at that time were using metal blades with a 60 min inspection time.
I wrote to my old squadron commander extolling the virtues of these blades and as a result they found out that there was a set sitting in a hangar at Boscombe Down, and had been for some time. These were transported up to Odiham, fitted to an aircraft and the trials and conversions started there.
Boscombe had nothing to do with it.