It sounds like the detained dual nationality Briton is (eventually) being released from Iran and is on her way back to the UK. It appears the Iranian authorities were holding her because the UK government was breaking international law for withholding £400M from a cancelled tank order in the 1970s.
Several things come to mind:
1. The UK government should always operate within international law.
2. The Iranian government has no right to hold an innocent mother all this time as a hostage and bargaining chip.
See https://www.bbc.co.uk/news/uk-60756870 .
UPDATE 1340z: She is on the plane. I hope she is soon reunited with her family.