Allan, who took up rugby at the age of 16 in 2002, had his debut for any Scotland age-grade team when made a replacement appearance in the 26-10 win against Italy in Vichy, France, in the 2006 IRB Under 21 World Championship.
He is a former pupil of Hermitage Academy in Helensburgh and is now studying civil engineering at Glasgow Caledonian University.
He's a member of West of Scotland Institute of Sport.