I hope it's ok to highlight this as I just found an email from them in my Junk folder about them closing down.
There is an automatic 60% discount applied to your basket, so no code needed. They have 2kg bags of both Salmon and Puppy Chicken varieties left with an August BBD. (They said it is safe to eat after this date, but the vitamin level is only guaranteed until then.)
You can buy the larger sizes of food for better discounts and it will come in multiple 2kg bags.
They also have Jerky treats in all flavours.
Free delivery over £25. (I ordered "6kg" of Salmon food, which will come as 3x 2kg, plus a variety pack of 4 x 200g jerky for less than £30 delivered.)