He also refused to pass judgment on Gary Barlow, the singer and a Conservative supporter, who has also been accused of using a scheme to avoid paying millions of pounds to HM Revenue & Customs. “I am not going to give a running commentary on different people’s tax affairs,” Mr Cameron said. “I don’t think that would be right. I made an exception yesterday because it was a very specific case where the details seemed to have been published and it was a particularly egregious example of an avoidance scheme that seemed to me to be wrong and I made that point.”