While browsing the net I came across this No4 MK2* pig sticker bayonet described as being a MK1. I assume that this is because the scabbard throat-piece has MK1 marked on it. The marking on the scabbard throat-piece only refers to the throat-piece, for anyone who doesn't know. i.e. it's a MK1 throat piece. In this instance the scabbard body is also MK1 but the bayonet body is MK2*, as stated above.

WWII British Spike Bayonet & Scabbard - Militaria
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