• Thanks @Fatberg and @Thrustvector useful both.
    I thought 25mm ply would be overkill - was thinking 18 or 22, but it looks ok there. @Thrustvector are those 25mm too? My alcove is 1.3m wide, and has a very similar relationship with the shelving on the adjacent wall at the moment... I am definitely leaning towards more twin-track. I'm thinking of full width shelves and 3 tracks at 50cm spacing. I'd prefer to go with 3 'bays' rather than 2 (for looks) but it seems a bit too close together. Would be getting the ply cut and delivered - I can't saw straight.
    @Fatberg - I used really hefty individual brackets to give extra support to a deep floating shelf and they've started to pull away from the wall, so I'm wary of that. Maybe I just hit a mortar joint but they are not staying in the (solid brick) wall :/

  • On checking the brackets are 17cm deep, and the ply is 18mm thickness and I think 20cm depth, which is enough for most books other than oversized art formats.

    I got all the ply cut at B&Q - one sheet was enough for both alcoves, and I managed to get it all done within however many free cuts they give you per sheet.

    @amey you and me both...

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