'Honest Jons' used to operate on the High Street in Camden Town, just by Camden Market but they are now long gone from there. The basement of that place was just busting to the seams with great LPs (including Japanese King imports) when I was a poor student living literally round the corner (sort of 'Withnail and I'). The same store was until about a year ago also operating as a (primarily R&B) vinyl and CD outlet, with a bit of nice jazz but was literally on the point of closing up when I was last in there. Managed to pick up a vinyl Sonny Fortune A&M Horizon though.