"F.F. & S. Ld" = Fred Fisher & Sons Ltd which was a socket forging subcontractor
Britain - The No. 4 Spike Bayonet
You'll find good basic information on the No.4 bayonet here:
Britain - The No. 4 Spike Bayonet
Edit - Ooops, missed the fact that the link was posted above. My apologies Alex.
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