I've been wondering about the London boat show all week myself.... I found all the same information as everyone above... but I also thought to check the events directory at the London Western Fair District Agriplex where it's usually held or at least was listed in their adds. I didn't find any mention of the boat show which was supposed to be held at the location below. Unfortunate.... I was really pumped about going this year too.
Western Fair District
Agriplex & Arena
Halls 1, 2 & 3
Western Fair District
Agriplex & Arena
Halls 1, 2 & 3