Well, no, but then none of the shows are exactly submarine related because it's a very niche hobby.
For instance, the model engineering show will mostly be aimed at model trains, traction engines etc. For the past two or three years that the show has run there hasn't been a pool available. Perhaps that will change this year, now that has moved from Wembley to Alexandra Palace.
Sandown has a bit of everything, but concentrates on aircraft.
There are some smaller shows throughout the year. But if you get 10-15 boats turn up at each, then you're doing very well.