Lots. We don’t produce half our food. Look at the country of origin on the canned food in your kitchen right now. If it’s not produced in the uk, stock up. This is a bit of a blunt instrument but it’s a start. I will stock long life milk, tea, coffee and powdered hot choc as well.
Meds wise I will stock paracetamol, ibuprofen, plasters, sore throat lozenges, soluble aspirin, tcp, bandages, cough syrup, burn cream. Make sure you’ve got hot water bottles/heat packs for all the family. Candles, matches, batteries, solar powered lamps and bottled water.
Im not expecting a doomsday scenario, but a period of civil unrest may happen, which I don’t really want my family to venture out in. I drive an electric car so as long as the power is on, we can still get out of London to our rural home if needed. I don’t expect things to get that bad. Most of this stuff we have in stock already, came in handy during a power outage and a mains water leak, both in London.