Log into wiggle, go to your preferences, y’know where you can select newsletters or whatever, change something and save changes and you’ll get a screen with a £5 off £50 voucher …its also emailed to you… you can change your prefs back again afterwards and it’ll send you another one.
Also, go to http://www.topcashback.co.uk, setup a free account and log in, search for wiggle, follow their link and you can get up to 5% cashback on purchases which is paid back to you in a few weeks into your topcashback account and then you can get that out to your bank.