If anyone is interested I have just come across this on Ebay:
http://cgi.ebay.co.uk/Backpack-Tipi-TeePee-lightweight-Firetent-Lavvu_W0QQitemZ200088642814QQcategoryZ36119QQrdZ1QQcmdZViewItem#ebayphotohosting
http://cgi.ebay.co.uk/Backpack-Tipi-TeePee-lightweight-Firetent-Lavvu_W0QQitemZ200088642814QQcategoryZ36119QQrdZ1QQcmdZViewItem#ebayphotohosting