Seeking UK baby travel advice! We're flying to England in August with our then-8-month-old, and we're going to be packing as lightly as we can and planning to shop locally if we find we need additional things. So, where do English and Welsh baby-parents shop for day-to-day necessities? Are diaper sizes the same there? What shops do I google if I need diapers, baby food, a toy for the car, etc? 

I'm working under the assumption that I'll be fine breastfeeding in public anywhere we go, and that she'll be welcome in restaurants and museums and such. Any particular tips for babies in Essex, London, Bristol, Liverpool or North Wales?