Is this the bastard? From the back cover of a photography book called Cathedral Cats by Richard Surman:
> Biggles, feline tyrant of Westminster Abbey, was born in a mining village and now hunts rats and other cats in the ancient cloisters. His daily promenade takes him right down the centre aisle of the Abbey, and he has been seen both asleep and sharpening his claws on the high altar. He hides in a dense Virginia creeper and surprises passers by, notably dogs and Japanese tourists. He was issued with an official warning by the Westminster police after he mauled a constable's trousers. Such is the stuff of Cathedral Cats.
I downloaded the ebook from Amazon but am having trouble finding him in it.