Was he homosexual or bisexual - his engagement and his acknowledgement to his fiancée that he had "homosexual tendencies" (eg http://www-history.mcs.st-andrews.ac.uk/Biographies/Clarke_J... ) suggests that he was not exclusively attracted to men what actual sexual activity he undertook is not known to men nor I suspect to anyone else who didn't share whatever arena he chose for his affairs.

The manner in which he was arrested rather suggests a honeytrap [I'm speculating here, assess for yourself] - which could account for any animosity of the UK Government, not particularly wanting to reward spies that fell victim to enemy traps. The other point at issue may be that Turing as a 40 year old was picking up teenagers for sex (according to the reports of his arrest) - would someone now be knighted who knowingly followed that sort of promiscuous lifestyle? Would you expect that to be true also in the mid 20th century?

Turing was a great mathematician and left a great legacy in that field, other aspects of his character appear less clear.