If anyone is interested in going to the boat, RYA members get a free ticket (follow link on booking page), otherwise the best code I found is JG1 (courtesy of John Goode) which gets you a pair of tickets for £13 instead of paying £21 each.
https://www.southamptonboatshow.com
Nice one!
Will be reasonably near around then so might just have a saunter over for an afternoon.