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Inflation is effectively controlled by the Bank of England MPC, which maintains interest rates at artificially low rates because of indirect political pressure: there is too much to lose (mostly in terms of the housing market) if rates rise. Inflation rates have therefore stopped being an indicator of economic activity.
This is my understanding as an armchair spectator, I am not an economist.
Explain quantitative easing in the UK in the last 7 years then? Over £350 billion 'injected' into the economy, inflation stayed flat.