The money Iran had demanded has nothing whatsoever to do with the imprisoning of Iranian born National Nazanin Zaghari-Ratcliffe.
( As a dual national you cannot get diplomatic help from the British government or any other government when you are in the other country where you hold citizenship.)
EllanVannin, The £500million with interest is the Iranian State assets that was held by The Bank of England, at the time of the overthrow of the Shah. it was frozen by the UK government, As was £12bn of Libyan assets, so have been Iraq Assets/Libya/ South Sudan/ Afghanistan/ CAR, etc. etc
Quite naturally the Sovereign Iranian government has been pressurizing the Bank of England, to release their frozen assets and pay compound interest on assets held.
I'm Sure It's a Repeat of the Summer of 1976
My dad spent 40 years mastering his craft, and last week someone half his age told him how to eat.😠


