I recall hearing the news he'd been Kinghted, and thinking what?!
But, allegedly , the reason that Boris recommended him for a Knighthood was to reward him for his silence. Apparently, when BJ was Foreign secretary and still married, Williamson walked on on Carrie, ahem, how can I put it, servicing BJ with a BJ.
If you want more detail Google twitter Private eye and Boris and Carrie, there's more on the story (it did get published in Times and Mail online but got pulled). And it was Williamson allegedly the MP who walked on them.
Realise this post may get deleted but if it's good enough for Private Eye....