Reports said the athlete had not yet resumed training and had no current plans to compete internationally.

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Under current UK law, anti-doping officials have no right to enter an athlete's premises without permission.

BBC: Anti-doping plans worry athletes

No current British or Irish athletics competitor - that is, a cyclist, track and field athlete or swimmer - made the top 100 in the year of the London Olympics.

BBC: David Beckham tops UK and Irish sport rich list

The current Guinness World Record for running the marathon carrying an equivalent weight was set by a Japanese athlete at 3 hours and 42 minutes at the Tokyo Marathon in February.

BBC: London Marathon: Ex-paratrooper runs for record