A little insight into numbers of sales involved from what I know of the Mozart Estate one at number 6 in the charts. This is by Lawrence (of Felt, Denim, etc) under his new moniker. This single was released as a limited run of 500 10" singles on 4th November, and I don’t think there were any other physical formats. It doesn’t seem to have totally sold out (Juno and Rough Trade are saying ‘in stock’) so something less than 500 sales to get to number 6!