I started buying jazz records in 1957, a time when older formats (78s, 10" LPs and 7"EPs) hadn't yet disappeared, but the new format of the 12" LP was coming in. The Vogue and Esquire items were 10" LPs or EPs. Some US recordings were reissued on British labels in 12" format; e.g. Monk's Brilliant Corners from Riverside on the London American label. No US imports appeared until about 1962, when the jazz press (Jazz Journal, Melody Maker) did a great deal of marketing of the arrival of selected Blue Note and Riverside 12" LPs. Stanley Turrentine's Look Out! was one of the first and they were very expensive. My copy of Monk's Music, bought in the later 60s, is still marked 42/-. Pity MG isn't posting anymore as he once calculated the cost of an imported US album at that time as a significant percentage of the average weekly wage!! I remember a fast-talking guy who'd managed to get a pile of Blue Note Jimmy Smith albums on credit being actively pursued by a record store manager!