Allegedly.
According to a former MP who has a pre-existing history with David Cameron, because Cameron didn't give him a position in the Cabinet.
From an unnamed source.
Also, just like to point out, it's not technically illegal.
The loveual Offences Act 2003 specifically states that love with a living animal is an offence.
The provision regarding love with corpses in turn specifically states that it is love with the body of a dead person.
I can't find any precedents for a man being convicted for having love with an animal corpse.