It claims on his wikipedia page that he "represented GB (age group 20-24) winning 2004 European Long Distance triathlon Bronze Medal in Immenstadt, Germany."
Upon further research, I don't thing a european long distance triathlon even took place in germany that year.
Here is a link to results of 2004 of the european triathlon union, no such championship in germany exists. Is this accurate?
As it was an age group race and not a major international (which shouldn't count as GB representation anyway but that's a different argument) seems hard to find definite results that far back - doesn't help his credibility though.