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There are a few types, the very fine ones are more expensive and the wings break down where the door pinches them if it's a bit too tight. I spent a while fitting mine because my neighbours were smoking outside the door and it fixed the problem for me.
I'm looking for the ones I've had before but the Lorient ones came up. I don't know if they are the ones to have but Ironmongery Direct are usually quite decent quality without being over the top.
Cool cheers! That Lorient company seems to be mostly commercial products, quite like using commercial stuff in a house, a lot of the stuff you find in the DIY shed stores + even the better builders merchants, the quality is pretty naff.
Spent most of a day fitting two fire doors, those seals are quite fussy about gap, 3 to 3.5 mm, smaller than that door is crazy hard to open or shut, above that and they don't do anything