I have a shoe fettish and have multiple Cheaneys, barkers, trickers, grenson, looks and more in my collection ad most have factory stores in Northampton definitely Cheaneys, trickers and Barkers as I visit the factories personally and there are usually decent savings to be had additionally they also have sample sales that also offer similar discounts but its pot luck as to what is there, so if you are committed to going then the factory stores are definitely worth a visit, if you google the factories call them to ask whats in stock before making the visit
Good luck