>> >> If a foreigner uses the pound to buy a UK export,
>>
>> If they were that desperate for UK stuff they would still be living in the
>> UK.
>>
You are missing my point.
UK pounds are useless in the foreign country, they have to be exchanged for local currency, and bought by someone else who needs sterling, to buy UK goods or services.
The money will therefore return to the UK, to play its part in the UK economy in exactly the same way as if spent by a UK-resident pensioner.
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