Ah, the Rotodyne. Its main drawback was the noise. I lived near White Waltham. You could hear it coming for miles! Not much good for a stealthy special forces insertion.
On the other hand, it sounded
exactly like a steam engine - a GWR Castle Class to be precise.
So maybe the bad guys would have been fooled. "No, that's not a helicopter. It's the 6:50 from Paddington."
