Instructions:We actually have some of these codes in the voucher section, but I'm doing this new post as a heads up to give information on how to combine the codes. If you add items to your basket, proceed to the checkout, and enter the codes one at a time, they combine to give you extra discount (60%)!
EDIT - I've just added another code and it is giving me 60% discount in my basket!!
EDIT - another code found by Hotscot, added to the post above