Hey Noel
If it was me, I'd look at roller banners, as here:
http://www.ultimatebanners.co.uk/orient ... -stand.htmEasy to move (unlike posters), don't sag like regular banners do (which rarely look any good) - and if you get good ones quality and longevity is excellent.
Obviously you're limited to portrait rather than landscape, but I think they're a smart, cool option.
Can't vouch for the outfit above, the link was just for reference. But if you need a supplier, we use guys locally who are very good, not stupidly expensive and do great quality stuff for big clients.
Hope this helps!
Jordan