The Office for National Statistics (ONS) released the consumer price inflation data for the U.K. on Tuesday. The U.K. consumer price index declined to -0.1% in April from 0.0% in March. It was the lowest level since 1960, based on comparable historic estimates.
Analysts had expected the index to remain unchanged.
The fall was driven by a decline in air and sea fares.
The Bank of England Governor (BoE) Mark Carney said last Wednesday that the consumer price inflation could turn negative, but it is expected to rise towards the end of the year.
Consumer price inflation excluding food, energy, alcohol and tobacco prices fell to 0.8% in April from 1.0% the month before.
The Retail Prices Index remained unchanged at 0.9% in April.
The consumer price inflation is below the Bank of England's 2% target.