I'm in a top floor flat of a small block. I'm in one of the vulnerable groups. Post comes downstairs to the communal entrance hall. I plan to collect it once a week in a mask and gloves. What do I do about food? I've found a local store delivering groceries but they'll only come to the communal block entrance. Am I being over cautious? Going down to the shared entrance means going outside in a way. I walk past several flats through a very small, narrow hallway. No windows so unventilated.