Cheers Dave, worth considering for a West Sussex Venue.
Drove past here today :
http://bridgeinnamberley.com/ looked very nice next to the River Arun (website does it no justice).
Also went to West Wittering Beach, which would be great for a SES BBQ :
http://www.westwitteringbeach.co.uk/history.html, parking, shop, good burgers
in the Café £8 to park but a bargain if you want to kill a few hours there doing a BBQ, sitting on the beach or just walking around the Chichester estuary
.