Have a L.E. Mk.I that had the same problem when I first got it. It was caused by a worn sear. I replaced the sear and it was as good as new. Unfortunately that was many years ago when you could get a sear from Springfield Sporters, not sure wear you could get a new one now. However if it is not badly worn stoning it might solve the problem.
Without looking at the rifle I am not sure why it would be marked EY and then DP, but I have similar thinking to yours in that it was an older arm. I own a 1944 dated Ishapore SMLE MK.III* that is DP marked on just about every part that you can imagine and it looks like it was just made (even has all matching numbers). I took it apart and could find nothing wrong wrong with it at all (the bore even gauges as new). As far as I can tell the only thing that makes it a DP rifle is the stamps all over it, but it shoots accurately.Information
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