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Thanks for that. Is Elfa better than other own brands twin track?
I've got a load on the adjacent wall which isn't very deep, maybe 25cm and I'm a bit dubious about loading them. But it's a wall apparently made of soot and horsehair, so hopefully the brick party wall would be better. Ideally I'd like to go quite deep on the shelves maybe 40-45cm, so potentially quite a lot of leverage.
hoefla-
I've not tried other twin-track stuff, but from reading reviews on the net it seems like Elfa's production quality is better than the cheapo stuff (and it's not that much more expensive); I was certainly happy with it. It's also made in Sweden, so I kind of assumed that meant better working conditions for the people making it.
I went for the Elfa 'classic' stuff, where the uprights screw into the wall. There's another variant where you screw in a track along the top of a wall, then hang the uprights off it, but as this was going into century-old dodgy brick I felt happier having the 5 or 6 screws on each upright. I went for a mix of shelf depths - 20 cm up high and ~35cm lower down, and they've felt fine.
Thrustvector
I've used Elfa twin-track shelving for book shelving in chimney alcoves, and ended up just using three tracks and brackets (so at ~60cm spacing). This meant I could just use 18mm ply for the shelves, and even heavy art books are fine. Once the books are on, the tracks mostly disappear anyway.