I think the Bonus' just had different colour options. From memory they only did black mk2's with a special edition. The Festival had a black option with a decent spec I think. The Bonus was a lower spec than the Festival but had some non-standard colours.

Most of the 'special editions' were just to get rid of them before the mk3 came out and are mostly found on 'F' plates.

I may be wrong on the above. However, that is how I remember them.