Pictured together is on the left an original independent release on Trafalger (1000 copies) without a distribution deal and it's insert of the band playing. On the right is the next pressing with a distribution deal with WEA - note additional line between Play Loud and the Trafalger Logo on back cover. Insert for this one is a different band photo with printed signatures and line at bottom about further copies from you local record store or direct from the fan club.
Third copy pictured is a further 1977 pressing with third type of insert a collage on matte paper which later reappeared as part of the Overseas version insert. Correct me please if I am wrong.