Interesting - the Harold Moores place always seemed to me to be like a classical records version of Gringotts, with the staff near-ringers for Gringotts elves. The ground floor classical area was stacked with rare and very pricy old analogue classical pressings, usually in superb shape. Much of it priced at £50 plus.
The downstairs jazz selection was usually a disappointment (initially upstairs, in the last period when Mole operated there). I did see an original Mike Taylor 'Trio' on the wall once at about £300 but the sleeve looked pretty beat up. In retrospect, probably a bargain.
Never got to see those 8000+ jazz LPs, although I have seen mention of that legendary story in various places.