I had the same problem but was able to get one online however it was the green one. I really wanted blue to match the tent and was worried it would look silly but actually ended up quite liking the difference. You can see it in my pics.
------------- Ashurst New Forest - May/June 2013 (1st camp)
Newlands Holiday Park, Charmouth - Aug 2013
Forgot to write this, been a while since I was looking however...
I bought a Gelert ottawa 6 canopy/awning (brown) for my
Vango Icarus 600 (green).
I couldn't use the side door the way I had set it up but I think I may have been able to with some fiddling about.
I have photos should anyone want to see them.