Sounds like you'll be ok Bananaman, got the 2009/10 rulebook in front of me, says Snell SA2000 or SA2005 and Snell M2000 or M2005 are approved if under 12 years old, which yours clearly is if made in 2006.
What brand is it, out of interest?
Interesting also to note that vehicles running 10.99 or quicker must have full face, anything slower and open face is permitted.
Cheers
Phil
Bookmarks