Nutty Corbyn aide Andrew Fisher has deleted his Twitter account after a string of stories about him abusing Labour colleagues online. This morning’s Times says Corbyn has been told to sack Fisher, while Kevin Maguire reports Jezza gave him a dressing down over the negative coverage last week. Amusingly Fisher has been going round vigorously denying he is “over-exposed“, which doesn’t quite add up to guiltily wiping your entire Twitter history. Guido readers can still see his catalogue of trolling tweets, including calling Simon Danczuk “dumbf*ck” and Rachel Reeves a “w*nker”, here…