After his tax hypocrisy was called out over the weekend, Ken has played another blinder this morning. He’s just strolled over to Downing Street to deliver a letter to the Prime Minister demanding that London Mayors are only allowed “one job”. While you would expect any opponent to try to make a hay out of Boris’ Telegraph column, you have to wonder why Ken didn’t do more to stop London Mayors having more than one job during his own time in office. Was it something to do with him spending over a year as a working MP for Brent East as well as Mayor? Or was it that column he, like with Boris in the Telegraph, himself had in the Indy…