Ha...Thanks!
I’m pretty sure that British Intelligence allowed Philby to escape, rather than suffer the embarrassment of a show trial...he was smuggled onto a ship and fled to Russia.
The interesting thing was, of course, blurring the lines between the two stories.
It was great fun to write.
Edit: to further explain the “sailed away” line...the fox was (I think) found dead in the street...it appeared to have fallen - or been thrown - off the balcony...so i sort of meant it sailed away through the air...trying to cover both eventualities...