Instructions:from their email:
Use coupon code FREEGROUND305 at checkout and receive free ground shipping on your order. The most you can save on ground shipping with this promotion is £25.00. Sorry, promotional codes cannot be applied to any previous order. You can only use the code once per account, and you can't use this coupon in combination with other coupon codes. This offer expires on 30 June, 2010 at 11:59 PM so try not to procrastinate! While very unlikely we do reserve the right to change or revoke this offer at anytime, and of course we cannot offer this coupon where it is against the law to do so.