I've had the KK one and the Bluebird and they are exactly the same,however the bluebird one is much cheaper (on offer a.t.m. £125 posted)..............
http://www.bluebird-type2.co.uk/Split%20bay%20exteriorparts.htm" onclick="window.open(this.href);return false;
but its only available in powder coated white.I found The finish on the frame is not the most pristine, and I decided to wood preserve the slats a bit more,but then, if its getting used it won't be pristine for long anyway.
al in all Bluebird is great, fits nice behind my Dormy pop top.There is one for sale over on VZi for £70, alot of interest but nobody seems to have gone for it - GET IN THERE DUDE !!!!.............
http://www.volkszone.co.uk/VZi/showthread.php?t=538173" onclick="window.open(this.href);return false;
hope this helps!