He's a Pathfinder Team Leader.
It wasn't a Games Day mini as such (the Kroot Shaper was that year's world wide special if I recall) but it was limited edition. Around that time the Studio would produce special miniatures that the various parts of the company (GWUS, UK etc) could use as they wished. Some gave them away at open days and tourneys, others sold them for a limited time, some only gave them away as prizes. Hence, some people will say they're Games Day miniatures, others will say they've never seen them. As he came out around the time of the Fire Warrior game some were probably sold on the back of that too.
Good luck with selling it!