Never heard of Lurpak but now when you say it, yes there is butter in foil (primarly used for cooking or baking). On sandwiches we have Bregott though.
Yes you can. No idea about the difference as the "butter in foil" thing is a bit.. foreign.. to me. But you can definitely keep plastic container butter in the fridge.
What? You dont have that in England??
I knew that cheese cutters...
... are unusual outside of Scandinavia. But how is butter knives not a thing over there?