It's hard to give an indication of the size, this view covers around a quarter of the exhibits and traders.
Prior to the opening of the NEC, this was the major music venue in the Midlands - all sorts played there - Abba, Rolling Stones, David Bowie, Pink Floyd, The Eagles - anybody who could attract a crowd. The only thing I saw there was Thin Lizzy and the sound was so dreadful that I swore I would never part with money for anything else there - when ZZ Top came, we had a picnic in the field at the back and were treated to excellent audio, and no ticket fee...
Also, there is a somewhat larger scale outdoor railway there -