The 12-month inflation rate hit 1.8 percent last month compared with 1.6 percent in December, the Office for National Statistics (ONS) said in a statement.
Analysts' consensus forecast had been for a jump to 1.9 per cent, according to a Bloomberg survey.
Nevertheless, the January reading was the highest level since June 2014.
"The main contributors to the increase in the rate were rising prices for motor fuels and to a lesser extent food prices," the ONS said.
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