I believe that following an accident, one of the Puma's on 33 had the tailboom from an Argie puma that was brought back from the Falklands. Then they decided to use the Argie fuselage to make up for an attrition loss by demodding the Argie fuselage and had to buy a new tailboom, then mod it to RAF standard and it was still flying around 10 years ago. So there are plenty of cut and shuts. However, having flown on some of them, you would never know.