In reply to Blue Straggler:
Probably based on not much more than my sense of gloom allied with how the pound has done so far, I'd get the money sorted now. If we somehow end up not leaving the EU or having No Deal, the pound could rally I guess, but that's longer away than six weeks.
If you could have a nice holiday with the current exchange rate, and the pound strengthens after you've changed your money, I guess it's basically a process of managing one's thoughts to avoid feeling 'irked' rather than a physical form of suffering.
I'm obviously not an economist....
Post edited at 14:11