Page "Catalog numbering systems for single records" Paragraph 37
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On Decca's British London label, which began in 1949, HL was at first used alone, but from 1957 there was usually a following letter denoting the original American label ; thus Atlantic and Atco were HLE, changing in 1960 to HLK, Sun Records was HLS, Jamie ( Duane Eddy's label ) was HLW, and Big Top Records ( Del Shannon, Johnny and the Hurricanes ) was HLX ; while HLU was used for a number of labels including Phil Spector's Philles, and Monument, home to Roy Orbison.
Notably in 1957 two versions of Ain't That A Shame were released simultaneously, the original by Fats Domino ( from Imperial, HLU 8173 ) and the cover by Pat Boone ( from Dot, HLD 8172 ).
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