When is the best time to convert Euros into the British Pound?
Personally unless you are absolutely desperate for the money I wouldn’t bother changing the Euros back to Pounds. Just put them away for when you next visit a Euro country. The reason is by changing it back you lose out twice. You lose a bit of money on either commission or reduced exchange rate over the ECB base rate when you buy the Euros to begin with, then you lose out again for the same reasons when you change the Euros back to Pounds. So if the idea is to get the most for your money, leave the Euros as they are for your next holiday or whatever.