Not many of these comments seem to be (what I consider) to be ACTUALLY in the North East!
@dan4x4 is right, Ash and the guys at AM Aquatics in Team Valley Gateshead are really helpful. they have recently done out the fish section and they frequently have event nights (or at least for their marine stuff). They also had possibly the biggest Discus I've seen.
Further afield I would go to Fish Alive in Dragonville Durham- big set up, not so much on plants but a huge range of fish. I got my Aquanano 40 from there and they were really helpful. They stock huge range of shrimp, and also massive Oscars, Arowana and stingrays, if that's your thing.
If you're prepared to travel, I cannot recommend Chilton Aquatics in Ferryhill enough. Paul and the gang are amazing, they have a huge range of products and fish. I bought my Juwel Lido from them. They stock the full range of Juwel & Aqua one tanks. They also cater for the entire Seachem range too and a large choice of live wood and rocks. They have a big marine set up and general aquatics. But they also have a hidden room at the back- extra insulated with Kingspan on all the walls-the room is simply just full of breeding angels and prize winning Discus fish. Every visit seems to take me an hour as the lads are full of knowledge, the wife just loves sitting in the car up there waiting for me
Further across Newcastle there's not a great deal...there was a place called Betta Aquatics in Byker, not sure if that's still there.
Dobbies at Ponteland couldn't sex Guppies and were really expensive, the guys at Birtley were a bit better but seemed understaffed.
I would say stay well clear of fish at P@H Washington (or any others for that matter), but the plants I've gotten from there are just too much of a bargain to pass up! The staff would always give me extra tropica pots looking (a tiny bit) worse for wear if I bought something... they were amazed how everything comes in so healthy, seems to pearl for a few days in mere tap water, then just rot away... catch em at the end of a week for bargains

I've been given vals, Nymph Taiwan, crypts, cardamine lyrata, umbrosum etc that all just needed a little TLC.
I'll follow this post because I'm always on the look out for shops around. Ash at AM is the closest for me, but Paul and the lads at Chilton are right near my parents should I chose to visit
Reayman