Worth a spin under a record cleaning machine, if available. I reckon lots of copies might have pressing detrius on them - one of the tracks on mine clicked until I ran it under the machine, even though visually it was flawless.
Here's hoping that Dutton Vocalion put out a few more of the Lansdownes on vinyl. The Guy Warrens would be nice !
Not sure I would totally agree with you on 'Integration' ( ) but I agree it's also a really, really nice session that is well worthy of reissue on vinyl by Vocalion (and another CD issue would be good). The fact that 'Hum Dono' has Harriott on it gives it that 'historic/landmark' edge, I guess.