Don't panic - Be Prepared!!

Yeast and flour here were the only real problems, although we were lucky to have just bought 25kg of bread flour from the water mill just outside the village (how quaint) I ended up using that for everything! Yeast disappeared so we had to perfect sourdough fast. We now have a small stock of yeast - enough for six weeks perhaps. We'll get another 25kg of flour next week, assuming Pierre has some.
It was much worse in the cities.
I didin't go out for 2 months but MrPP reported empty pasta shelves from time to time, and the supermarkets have all massively reduced their ranges (and hopefully waste) and it hasn't gone back to the old normal.
Compost was a problem for me too - none in the supermarkets and the GCs all closed.