1506 wrote:

So if someone uses a taxi in England and offers nothing but Scottish
money, are they committing an offence, and if so, what is the legal term
to describe the things that can be used to settle the debt to the taxi
driver, namely English notes and British coins?

Those are exactly the circumstances to which I referred earlier in
this thread. Whilst working in Edinburgh I took my spouse for a
weekend in London.

One evening we took a taxi from the Regent's Park area to Piccadilly.
I paid the cabby in Scottish notes. He was very unhappy but I had
nothing else with which to pay him. The guy had two choices, guess
which one he took!

He had a third - drive you to the nearest cash point and you could have got
some English notes. A lot of cabbies will accept this (and keep the meter
running while you do) as the best way to handle people who find themselves
short or in an awkward situation.

But if he were to take the fourth option then technically you would have had
an undischarged debt.