"give up its currency. In Britain, that was in play in the 1990s until Margaret Thatcher stopped it."

Mrs. Thatcher was forced out as Prime Minister (PM) in November 1990. There is no evidence that she did anything to keep Britain out of the euro.  In fact, Britain joined the Exchange Rate Mechanism (ERM) of the European Monetary System in October 1990 when Thatcher was PM.

The two people responsible for keeping Britain out of the euro are:
1. George Soros whose hedge fund forced the pound out of the ERM in 1992;
2. Gordon Brown who set conditions for Britain joining the euro that he knew would be close to impossible to achieve.