I've never heard 'Movement' (and the only LPs of it I've seen were less than pristine copies in mono going for the best part of £1k !) Not heard 'High Spirits' either - in fact never, ever seen a copy of it.
My CD (and the McNair) is on order from the boys at HMV. Both of these are important releases.
My guess is that they have access to the material held by Universal - which ponders the question, why no Neil Ardley 'Dejeuner', Phil Seamen 'Live', Colin Bates 'Brew' etc?