People probably already stocked up on the previous big sale, but it sounds like you can get a much smaller 10% coupon if you sign up for the newsletter valid until the 30th November 2011.

From their email:
"To help us send you the news you want to hear, sign up to SKINS news and tell us what your favourite sport is and whether you're a guy or a girl
As a special thanks, we’ll send everyone who re-signs up a 10% discount code valid until 30th November 2011"