"In my view carelessness can be equated with "negligent conduct" in the context of discovery assessments undersection 29 Taxes Management Act 1970 . In that context, negligent conduct is to be judged by reference to the reasonable taxpayer. The test was described by Judge Berner in Anderson (deceased) v Revenue and Customs Commissioners[2009] UKFTT 206 at [22] , cited with approval by the Upper Tribunal in Colin Moore v Revenue and Customs Commissioners[2011] UKUT 239 (TCC) : "