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"However, under current legislation, UKAD only has the power only to investigate athletes and entourage (including medics) who are themselves governed by a sport and UKAD will vehemently pursue any avenue that indicates that an athlete is doping or support personnel are assisting them.
“In relation to this specific case, UKAD commenced an investigation into Dr Bonar following interviews with a sportsperson in April and May 2014. Following those interviews and an investigation, UKAD found that there was nothing to indicate that Dr Bonar was governed by a sport and UKAD had no other intelligence to corroborate the sportsman’s allegations"
As I understood it they were pretending to be a sports person looking for help, so he thought they were a potential client.
It doesn't actually say that in either of The Times articles though. The one linked to upthread is the main article, below is the other.
So what they told him/who they claimed to be is a good question.