Errr - No! NSB are the current type - have a look at (say) Screwfix or TLC and you'll see that they're the ones they're selling for the "NH" range of CUs.
However, I've had problems getting several NSB types to coexist - despite the same name, they come in various varieties, which may be age-dependant, and they have slightly differing spacings. I right pain!
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