I believe "ED/&Co." is Elder Dempster & Co. Ltd of Liverpool.
I don't have Edward Dunlop & Co. listed in my catalogue (or I just can't see it!) but it's a 1998 edition and many additional perfins have been identified since.
I also don't see any "E/CN" entries but I suggest it's an inverted "CN/E" (as stamp blocks were usually folded and then hand punched to create perfins so inverted, reversed, and inverted and reversed perfins are common.)
"CE/N" is Comptoir Nationale d'Escompte de Paris, London.
"L/EC" is either London Executive Council, National Health Service or Lindsey Education Committee, Lincolnshire. Both perfins have the same size and the same pin counts.
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