I have just finished the Philby bio by MacIntyre.
Astonishing to present day thinking that Philby, Burgess and Maclean were all, in effect, presumed innocent until found guilty despite giving off signals that they were not to be trusted with the price of bus ride. The Establishment at its worst. The attempts at coverups continuing for years after the events were ludicrous and amateurish.
Having now waded through all three biographies I am at least comforted by the fact that their exiles in Russia were basically unhappy.
Blunt is next up for a read. No exile for him.