Hah Right, I remember 5A and 15A being common in my youth, and the porcelain"pepper pots" fuses as we called them, lots of folks electrics now looks like it belongs in an old horror film with Boris etc LOL
Come to think of it I think that Flameport might have some such in his Dark Museum .
EDIT: There has been quite a history of these plugs/sockets, (from memory) I think BS73, BS 327, BS372parts I & II, BS546. essentially dimensions of pins have been consistant throughout.
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