But the dutch sprint coach has been drafted in by Wales ahead of the RBS 6Nations and has paid special attention to helping Shane Williams return to his explosive best.
The two- tour Lion returned to action after dislocating his shoulder, three weeks ahead of schedule but has only played 20 minutes of competitive rugby.
Williams is likely to line-up against Ashton in five day's time, if the Saints flyer shakes off his thigh injury, and the Welsh record-try scorer is relishing the opportunity to lock horns with the player 10 years his junior.
"Ashton's a good player and the work he's done with Frans has paid dividends because he's had a great season," said Williams.
"He's played well in a good Northampton side and scored some great tries in the autumn series. He showed a great turn of pace for his try against Australia when he went the length of the field - he showed some gas there.
"We'll have to keep an eye on him. But England have other good backs like Foden and Marc Cueto.
"But Fran's with us at the moment. He's good to work with and makes sure you get the little things right.
"He's been doing a lot of work with guys like myself, Leigh Halfpenny, Jamie Roberts and Lee Byrne.
"Before the injury I was as quick as I've ever been, but even now I feel very sharp, my training has gone well and I don't think I'm far off that standard."
With 53 Test tries to his name, including two for the Lions, Williams is bearing down on world record try-scorer Daisuke Ohata with 69 and Wallaby great David Campese on 64.
But despite his impressive try-scoring feat, Williams has only touched down once versus England, albeit the vital try that set Wales on the road to a Grand Slam in 2005.
Williams added: "I'd love to be able to overtake Campo but going into the Six Nations I'm not going to say I want to get on the end of all these tries.
"I want to get involved in rugby as much as I can and if that means finishing off tries so be it.
"Campese's one of my favourite players of all time so if I can beat him then fantastic. But he's a legend in his own right I'm not going to hold it against him if I don't reach him.
"I just like to get my hands on the ball and if I can put boys through holes then great. But it's about more than just one player, we all have to play well."