It's ok - I think I got this sorted. Thanks!
12x12 is just perfect for covering our campsite - but I guess we could go smaller...!
I think the Hennesy hex ultralight is a little bigger than the standard hex and might do the job for you.
Else you could try and get hold of a Kelty Noah's Tarp 12 ( they also do it in 9 and 16 )
http://www.cabelas.com/prod-1/0038273517301a.shtml
http://www.theoutfitteratharpersferry.com/servlet/the-1322/Kelty-Noahs-Tarp-12/Detail
In sale until 20/1/08 at $43.16 so unfortunately just over the ammount that you have to pay duty on, hence a delay in receiving and be charged about 30% tax and a £8 admin charge at the UK end ( you get charged the %30 on the P&P too
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
) unless your very lucky.
A bit light in colour but the nearest I know of to your specifications. Also as it's cantenary cut coverage from the center is only about 5' 6" to the nearest edge in 4 directions.
Trouble with both the Ultralight Hex and Kelty is I can't find a UK supplier so doubt you'd get one in time, unless it doesn't get stopped at HM customs. I guess if you know someone in the US they might be able send you a secondhand one as a gift, which will obviously be worth less than the £18 which is the point at which Customs start taking an interest, so arrive in time.