Instructions:New users who register get a code for £10 off their first shop.(£10 minimum spend I believe).
It says in the Email that it can't be used on sale items, but I added a sale item top at £5.99, and a full price top at £7.99, and it took the £10 0ff, so 2 tops for £3.98.
P&P is £4(or free over £50) though, but thought it might help someone.
Also use http://www.quidco.com/punkyfish/ for 20% which is a minimum of £2.
So you get a free item from PunkyFish, Pay for the p&p (£4) and get £2 quidco.
Total price: £2 for a £10 item + delivery. Not bad.
Not sure on the expiration date :/