Papers covering the UK's exit from the Exchange Rate Mechanism in 1992 have been released after a Treasury document was inadvertently e-mailed to the BBC.
The Treasury said it regretted that the BBC had revealed some details it had not wanted to be in the public domain.
BBC 9/2 2005

The Financial Times had requested the Treasury assessment of what went wrong.
Black Wednesday, 16 September 1992, was the day Britain crashed out of the ERM - a system for tying the pound and other currencies' values to that of the German mark, and was a precursor to the creation of the single European currency.