Cheap, one-piece bayonet cast from the finest melted-down Matchbox cars. Guaranteed to be more brittle than your 90 year old grandmother's bones. Fits around the muzzle by its metal handle, so is guaranteed to get so hot that you could boil a pint of water just by dipping it in briefly, if you are lucky enough to have an asbestos glove to take it off with.
It has some interesting features such as slight serrations (supposedly for cutting webbing/seatbelt straps) and the inability to hold an edge (if you are naughty and sharpen it). This is usually indicative of a soft metal but remember you can hammer out any nicks you get on the blade from cutting string. Is one of the great British Military Procurement Mysteries of the modern age.