Whyperion - As you likely know, those DSS promos were mainly for Orchestra music (proper worthy music Decca concluded than that for pop). Moodies fell into this cagegory accidentally. The story is well documented.
Its ironic that the promos are indeed mono, what a way to enjoy DSS?
ZZ, this promo is one of the samplers for the LP, and mentions the 'Deramic' Sound System that Decca had 'invented' and appears one of the few 7"s to mention this, most of the other promos on Deram singles were the plain blue ones.