I got into running only a few years ago, but have since completed 30 or 40 marathons and ultras, including the Marathon des Sables and a couple of non-stop 100 milers.

My next big challenge, assuming the event takes place, will be the 350 mile 6633 Ultra in the Canadian Arctic in early 2013. I walked the West Highland Way over the course of a week in 1992, so I'm looking forward to running the route 20 years on.

In terms of a finishing time, my current estimate is something like 22 - 23 hours.