For those who stock up on larger volumes of dog food, Harringtons are doing a good deal at the moment of 30% off first order (with free delivery over £30). By way of demonstration of the saving, I tend to buy 15kg bags off Amazon (eg. Lamb and Rice Dry Mix currently = £21.67) and the same product would normally be £25 on the Harringtons site, but with the 30% voucher code saving [FIRST30] this comes down to £17.50 (a saving of over £4 over Amazon). Naturally, postage needs to be added if under £30, so I purchased 2 bags to avoid this charge. Delivery looks pretty speedy to (I purchased before 12pm with delivery scheduled for following day).
T&Cs for the offer located here
Screenshot of purchase of 2 x 15kg bags for reference below