the postcard holders have arrived, this is what they look like:http://www.3ddisplays.co.uk/displays/brochure-wall.htm
and Jim's thoughts about A1 stuff:
Any pref re. tablecloth colour? O.K, mountboard - it can look good if you decide to use it. You would have to transport quite a bit of it down, in A1 folios. I would recommend it myself. The other option is to stick with double sided tape 3cm strips of millboard on the top and bottom of each printout so that they hang down, but off the surface of the board. This is what I did last year with the large printouts and worked well. You could do a test - I think just sticking them on looks a bit cheap.
DO WE WANT BLACK TABLECLOTHS?