Comment by PhilMH:
Hi Hawkmarty, I think your version is the first issue; this was reviewed in GRAMOPHONE's December 1968 issue, and the review includes the statement "the sleeve contains hinged details of Mantovani's repertoire and an article about his music". Release month was September, according to Decca's catalogues.
Comment by Hawkmarty SUBS:
Added a strange version. Gatefold sleeve with an integral centre page and a different label design.