Thanks for the replies secret squirrel and Jipe. The following bike is being offered locally so I'm sorely tempted. After reading your comments and doing a bit more research, I'm fairly certain its a Mk3 (the disc brakes are the giveaway).

Is there any way to zero in on the actual year model? The seller is a recycle center so is clueless.

Also, whats the maximum saddle to pedal length possible with the Birdy's standard seat post? Are there long seat post options if needed?