That seems to be the way of it! Perhaps they wait and see how much exhibition space they can sell before deciding how big/small the feature is going to be! I have been in touch with them recently so will see what I can find out and will let you know if I hear anything.
Great pictures Emma. It's a great looking product. Will you be at Ecobuild yourself? We are going to be there again - we were also involved in the Cityscape feature at Ecobuild 2009 (providing the soil-less Grassfelt for the mounds) - the SureSet products looked great as part of the SUDS feature. Hope to see you there.