Just got back from The Dortmund show which is popular now with UK hobbyists.
A very good, large show with 8 halls from everything from Boats to Planes to Railways.
Not too good for the sub enthusiast though. No Trade Stands for submarine products and a limited number of subs in the pool. You will see a lot more at the typical UK show e.g Merstham
Hope the attached photos give a flavour. The Robbe U31 was new to me. Contents of box looked flimsy but only Euro 350 however an Engel tank needed as an extra.