By Zoe Delaney Janet Street-Porter has finally set the record straight on what went down on her snooker table when Keith Allen and his “mushroom” popped round to hers after a wild night out. For those not familiar with the intimate details ofLily Allen’s dad’s sex life, it’s long been thought that the Vindaloo hitmaker, 70, bedded journalist Janet, 77, back in the day – mainly thanks to Keith bragging about his alleged encounter with the Loose Women star in his 2007 memoir. “I wish I had the skill to describe in detail the first time I made love to Janet Street-Porter,” Keith wrote in his auto…