Jessica Ennis-Hill has called on the IAAF and the World Anti-Doping Agency (Wada) to address the problem of doping after fresh claims of cheating.
"It is never good to hear of new possible doping offences in my sport, but if we are to stop a few athletes thinking cheating is acceptable, we have to explore all information that comes to light, however damaging it is for the sport as a whole", she said.
According to the Sunday Times (£), leaked data reveals that more than a third of medals - including 55 golds - have been won in endurance events at the Olympics and world championships by athletes who have recorded suspicious tests.
It is also alleged that a top UK athlete is among seven Britons with "suspicious" blood scores, while 10 medals were won at the London 2012 Olympics by athletes who have reportedly recorded dubious test results.
There will be outbreaks of rain across Northern Ireland, southern Scotland and northern England which will reach northern Scotland by late afternoon,
whilst clearing northern England by early afternoon.
Expect it to be fine, very warm and increasingly sunny elsewhere, but with showers in the west later.
It should also be a breezy day with the strongest winds in the northwest, and a top temperature of 27C (81F).