1) You'll get a personal 'friend code' in your box (those vouchers) or through the website (https://tails.com/refer-a-friend). Give this to your friend when they sign-up.
2) They enter your code at the very beginning, then they can tell us all about their dog and get.
3) Your friend gets a month free trial with £1 delivery! Win!
4) Pop on the website and you can claim your £10 credit! Win Win!