I had 1000CHF notes when we first came here, before I set up a transfer from my Novartis account to my bank account. It was a bit odd having my monthly salary made up of just a few notes. ( Aside: one of my colleagues used to take his money from his Novartis account in this way - one time his wallet was stolen and he lost 5000CHF ).

Avia garages won't accept 1000CHF notes.

I once bought a Times from Heathrow for £1, with a £20 note, but was asked if I had anything smaller. Part of the reason for the reluctance to take larger notes, is that in the UK, the floats seem to be much smaller than here.