Peter think we agreed to disagree a few years ago regarding the DT...... but regarding the Kings Regiment, I have never seen a bayonet marked Kings as yet...... but have seen a frog marked Kings.
I have only had a basic list but there is the,
Small Arms Unit Marks : Instructions For Armourers (with amendments 1916) : APPENDIX IX - Marking of Arms - List III
which I gather lists the Kings (Liverpool) Regiment as LL, (must state I don't have a copy and looked for one on and off)