Hi Matthew, you may be interested in posts by Jenn and me in another thread where we shared info on mask orders in the UK:
Well, if you want to have some fun with it, you can now design your own masks on Teespring :-) https://teespring.com/search?q=mask
cassiopaea.org
Well, if you want to have some fun with it, you can now design your own masks on Teespring :-) https://teespring.com/search?q=mask
cassiopaea.org
As for the freezer, I slept for a few days in a room with one some time ago and found it really annoying. So unless you have a really tough sleep I'd advise you against it.
Canned food is your best shot as it won't rely on electricity and power shortages to stay fresh. If you really don't want to go into shops how about online shopping? I think all UK supermarkets offer this service.