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.
Two brilliant tracks from the VERY brilliant album In Search Of The Lost Chord (that's what I'm listening to as I write this).
It deserved to go higher in the charts than 27, but then again, the album is so brilliant that people understandably bought that, and therefore didn't feel the need to have this single in their collections.
I notice from the matrix numbers that the two tracks were recorded at slightly different times. I think in this case it's because they recorded one track at a time, spending hours making sure each one sounded perfect, rather than banging out three or four tracks in one session.