The long gilt future was off 0.24 points at 109.68, after a warning on inflation by economist Sushil Wadhwani, a member of the Bank of England's Monetary Policy Committee.

BBC: Friday close

The ONS said RPI would also continue to be used for long-term index-linking for gilt and bonds.

BBC: UK inflation rate nudged up to 2.8% by rising fuel costs

Investors were also ditching long-dated British bonds: the 10-year gilt yielded 3.14% on Monday afternoon in London, up from 3.13% on Friday, while the two-year British gilt lost 5 basis points to yield 1.56%.

FORBES: Market Scan