If anyone wants cheap tent carpets I have just ordered a couple of these for the bell tent on the basis that even if they aren't great they are CHEAP at £10. According to ukcampsite thread this one is about 2.1m x 2.6m. Will do for garden if nothing else
www.campervanaccessories.co.uk/royal-vancouver-tent-carpet-p-9857.html
ukcampsite thread: www.ukcampsite.co.uk/chatter/display_topic_threads.asp?ForumID=6&TopicID=243888&PagePosition=1&ThreadPage=1&ReturnPage=Search&search=carpet&searchIn=Topic