When travelling, it would be good to be able to split the transaction based on the transaction currency.
An example of this would be:
4 friends, with Monzo, have a €100 bill we split. When splitting, we have to define the amount for each person in GBP, requiring us to convert what people owe.
The desired behaviour would allow us to split the bill in €, and have Monzo request the correct amount of GBP back in the bill split.