The sport has been the subject of several controversies in recent years, which has centred on allegations of state-supported doping in Russia, revealed by German television channel ARD.

Russia has been suspended from competition by the International Association of Athletics Federations (IAAF) since the publication of the first report commissioned by the World Anti-Doping Agency (WADA) in November 2015.

Kenya also been regularly been tainted with drugs problems with around 40 athletes from the country have tested positive for banned drugs since 2012, including three-times Boston Marathon winner Rita Jeptoo, who failed for EPO in 2014.

It was announced earlier this month that Kenya’s Olympic marathon gold medallist Jemima Sumgong had failed an out-of-competition test.

Speaking to WADA Talks series, Radcliffe believes steps taken by the IAAF have boosted the athletes’ voice and believes the sport is moving forward.

"I think we have come through that, I have a lot of faith now," she said.

"I have faith that in my own Federation the athletes’ voice is being listened more than it has ever been before, [it] has a vote on Council.

"The integrity unit is going to be really important moving forward, I think that is going to be ground-breaking in terms of having an independent body protecting the integrity of the athletes and looking out for the athletes’ rights across all things.

"I do believe it is a cleaner sport than it was coming into it as a child, there is more support there."

Radcliffe has been an outspoken campaigner against drugs in sport during and after her career.

She faced allegations in some sections of the media in 2015 that she had blood-doped before being cleared by UK Anti-Doping and the IAAF.

Radcliffe repeated her call for doping to be criminalised, while she urged sporting organisations to use part of their marketing budget to help funding anti-doping efforts.

The 2005 marathon world champion believes the quality and equality of testing needs to be improved.

"I think there are a lot of areas which need to be improved, primarily the quality and standard of the testing," Radcliffe, part of the BBC commentary team for the Virgin Money London Marathon tomorrow, said.

"We have to get to the stage where the testing is good enough that an athlete can prove they are a clean athlete and I am not sure we are quite there yet.

"I am not sure that everything that is being used and manipulated out there is able to be picked up in the testing.

"We need to get to equality of testing, that wherever you are in the world you are subject to the same standards of testing and compliance as every other country.

"We are a long way from that at the moment."

The WADA Talks series features interviews from leading figures from athletes, sport, politics and other partners involved in the clean sport movement.