Willie B
Mate I just had another look at My Martini Enfield.
The bayonet is socketed , ( like a bayonet light globe ) twist and push down ...sorted.. cmon Mr Zulu ..

The Bayonet is 58 cm ( nearly two foot long ) , and is triangle shaped , scalloped out , and tapers to the point.
I am not expert but your picture looks to me as being more modern / ceremonial ?
Hope this Helps
Cheers