LP releases on London Records and its various sublabels (Parrot, Parrot, etc.) as pressed by that plant, bore an 'SH' suffix after the matrix number as on the label or 54 numerical code on 1979-84 pressings for PolyGram sublabels, or by a backward embossed (Ƨ) in a circle (by 1979 without circle).
Matrix / Runout: SLH 638 SH (Side A label) Matrix / Runout: SLH 639 SH (Side B label) Matrix / Runout: SLH-638 𝒮𝒽𝑒𝓁𝓁𝑒𝓎 M HC SA 3-10-72 Ƨ (Side A etched [Ƨ stamped]) Matrix / Runout: SLH-639 𝒮𝒽𝑒𝓁𝓁𝑒𝓎 𝘔𝘢𝘴𝘵𝘦𝘳𝘤𝘳𝘢𝘧𝘵 𝘔𝘦𝘮𝘱𝘩𝘪𝘴 HC 3-10-72 Ƨ (Side B etched [Ƨ stamped])