Should I stop now...
SPECTRUM
Spectrum was the record label of a firm called 'Colortone', which initially was based in premises in Dawes Road, London; it had moved to New Malden, Surrey, by 1976. The Spectrum label appears to have been devoted to budget-priced Easy Listening LPs in the main, though it issued at least fourteen singles, somewhat intermittently, in three consecutive numerical series: SP-0, SP-100 and SPEC SP-100. As for dates of operation, SP-12 dates from 1967, which suggests a starting date of c.1966; the highest-numbered single I have traced, SPEC SP-114, Helen McArthur's, 'Bonnie Scotland', came out in April 1976. Thanks to Reuben Kay for discographical information and for drawing my attention to the fact that the label on Lenny Dee's 'Some Kind Of Summer' (SPEC SP-111; 1973) was of a different design: it was red with silver printing and it had no logo, just the name in italic capitals at the top. Needless to say, none of the company's singles ever threatened the Charts, and they are hard to find nowadays, as the gaps in the discography below demonstrates. Distribution of the Helen McArthur record was by Clyde Factors north of the border.