Found 1st Sep 2015
Just looking on my Supermarket and saw this promotion. Minimum purchase £30 to get £10 off excluding shipping. First time Shops purchase only and one time per user. Promotion ends once 1,500 vouchers have been redemmed or at midnight on 2/9/15 the earlier of the two. See full promotion T&Cs in help centre. Hope this deal can help someone HDUK.