Brown gave the Bank of England power over rates before his own government could use it

Labour won the 1997 UK general election after 18 years out of power, and its incoming Chancellor, Gordon Brown, inherited a problem no speech could fix: markets and the previous Conservative government associated Labour with the 1970s inflation crises that had driven Britain to seek an IMF bailout, and no promise to be different this time was going to be believed on its own.

Brown could have promised discipline, appointed hawkish advisors, or set a public inflation goal while keeping the Treasury's hands on the interest-rate lever — but all of those left the decisive power exactly where it had always been, with a government that markets had every historical reason to distrust. The only way to be believed was to no longer be the one holding the lever.

Gave the Bank of England full control over interest rates, removing the government's own ability to set them for political gain, which made the promise credible.

Retained discretion is inherently suspect; markets can't verify promises to use it well.

Transferring power removes the mechanism for political pressure, not just the intention.

Bond markets recalibrated risk within days because the structural change was credible and hard to reverse.

When your past makes promises unbelievable, don't promise to behave—give away the authority that enabled the old behavior to someone you can't pressure.

Long-bond inflation expectations fell roughly 60 basis points within two weeks, a move researchers called ten standard deviations. Bank of England independence held across governments of both parties for decades afterward and became the reference model cited when other countries debated insulating monetary policy from electoral politics.