As an aside what's the gen for flying a single engine jet at 500' over central London or one of the BofB single engine a/c bearing in mind glide clear and all the rest of it? Are they supposed to make the Thames in case of a donk failure? If so what about traffic on the Thames which I seem to remember is a bit busy?
Not questioning for one second the skill and professionalism of our gallant troops by the way, just interested as a private aviator.