Six central banks, including the Bank of England, have cut interest rates by half a percentage point in an effort to steady the faltering global economy.
No decision on UK rates had been expected until Thursday - and the move puts the interest rate at 4.5% from 5%.
The US Federal Reserve has cut rates from 2% to 1.5% and the European Central Bank (ECB) trimmed its rate from 4.25% to 3.75%.
The unprecedented, co-ordinated step came amid slumping world stock markets.
The central banks of Canada and Sweden and Switzerland all took similar action in the co-ordinated move.
China also cut its rate, but by 0.27 percentage points.
European financial markets reacted well, pulling back some of the losses seen earlier on Wednesday.
The last time the Bank of England cut rates in a special meeting was on 18 September 2001 - when rates came down from 5% to 4.75%.
In the UK, some mortgage lenders also immediately passed on the rate cut to borrowers - trimming their variable rates.
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