The latest figures showed UK consumer prices rose 3 percent in December year-on-year, in line with expectations and down from 3.1 percent in November, marking the first drop in inflation since June.

Sterling has rallied in recent days as hopes grew that some European Union member states are prepared to offer Britain more favourable terms when it leaves the bloc, and traders increasingly downplay political risks and instead focus on the better-than-expected performance of the UK economy.

Sterling was down 0.2 percent at $1.3754, the day's low, from a high of $1.3780 before the inflation data. Against a broadly weaker euro, sterling was up slightly.

The FTSE 100 stock index turned positive while gilt prices were little unchanged after the data release.

"The market may be reacting to the core inflation rate coming in a little below expectations," said Kallum Pickering, senior UK economist at Berenberg Bank, referring to the 2.5 percent year-on-year rise in core inflation, below expectations of a 2.6 percent increase.

Pickering said Tuesday's data did little to change his view of the direction of inflation and monetary policy.

While the impact of a weakened pound on import inflation would shrink in the coming quarters, the Bank of England remained concerned about the underlying rate of inflation rising over the next year or two and with central banks around the world tightening, Pickering expects the BoE to hike twice this year, against the market's view of one raise.

The BoE has said it expects inflation peaked in late 2017 before falling slowly over the next three years to just above its 2 percent target. Many private economists think the fall could be faster, possibly to 2 percent this year.

The BoE is widely expected to keep interest rates unchanged at 0.5 percent next month as it waits for signs that wages are rising more quickly.

"While we expect a notable fall in consumer price inflation over the course of 2018 this decline hasn't really got underway yet. As the FX impact on sterling fades during the year we expect rising domestically generated inflation (DGI) to only partially take its place," said George Buckley, chief UK economist at Nomura.