In their outlet store in Ashford today and everything had the following reductions
Any 2 items - 20% reduction
Any 3 items - 30% reduction
Any 4 items - 40% reduction
See the link for confirmation.
You could take advantage of this by using some of the cheaper items (£2.50 for a few pairs of socks for example) to reduce a couple of more expensive items.
E.g. buy a couple of items at £50 each, so total £100 and the reduction is 20% so total is £80.
Add in two sets of cheap socks for £2.50 each so the total is £105, but with the 40% reduction for 4 items you'd pay just £63.
One of the few times that buying more actually lets you pay less.