Restocking everyday pet supplies in the UK is rarely a planning concern. Major supermarket chains carry a wide everyday range of dog and cat food, treats and basic accessories, and even smaller convenience stores and petrol station shops typically stock at least a limited emergency range for travellers caught short.
For a wider selection or specific brands, the pet shop chains covered in the previous article — Pets at Home chief among them — offer considerably more choice, plus staff who can advise on anything from travel-sized food bags to car safety harnesses.
Given how widely available everyday supplies are, there's generally little need to over-pack food and basics for a UK trip the way you might for a country with a thinner retail network — pack enough for the first day or two, and plan to restock locally rather than carrying it all from home.