In the absence of the inimitable Mr. D'Oh, let's ask AI to take a look at this:
Margaret Thatcher shifted Britain's economy away from heavy manufacturing toward a service- and finance-based model, driven by privatization, deregulation, and the decline of industrial labor unions. This transformation centered on key shifts like the 1986 "Big Bang" financial deregulation and selling off state-owned utilities.
I've said before how dismal it is visiting the town where I grew up, an area which really was the birthplace of the industrial revolution. Now, everything comes out of the financial sector in the South East, and the Brits can't even build a decent rail system.