Anyone interested in this race may want to take a look at this in a series of 5 recently shown on s4c. Richard Harrington(who acted the main role in the BBC series The Hinterland) and Mark Lewis(also been acting in a few BBC roles) preparing and taking part in the race:
http://www.s4c.co.uk/clic/e_level2.shtml?programme_id=519881764
You should be able to get subtitles I think.