Thank you. Which leaves the Javelins.
Incidentally, this is all leading towards the following two statements:
"No civilian aircraft in the UK operating in IMC outside controlled airspace has ever been involved in a mid-air collision."
and
"The last mid-air collision between two aircraft in the UK operating in IMC outside controlled airspace was in 1941, over 65 years ago."
...can anyone think of any counter examples (pace the Javelins, which I am waiting for a definitive answer on)?