Now that I'm back in Uk, something interesting I've noticed compared to the D4 stores in Brussels are the brands. The fishing section here (which is too small BTW) has branded groundbait or luggage while the Belgian ones only have the D4 or own brands.
The last time I've been I've purchased Gooster Feeder bags (I do like it and it's cheap), pellets from Dynamite and a few items from Flashmer.