Aepervius
Non credunt, semper verificare
That went well last time!
That was ERM I which was changed to ERM II to prevent such problem in the future.
Also : "the unfavourable position at which the United Kingdom joined the ERM, believing the rate at which the UK was brought into the Exchange Rate Mechanism was too high, their inflation was also much too high (triple the German rate), and British interest rates were hurting their asset prices"
The black Wednesday came in because mostly Sorros short selled the pound.
That situation is not comparable to what you have today.
IMO If UK had no pound but an euro, it would not have happened btw.