Worldpay's private equity owners, Advent International and Bain Capital, have narrowed the price range set for the London listing of the payments processor, according to sources.

The owners are reported to have trimmed 10 pence off the higher and lower end of the price range to 235 pence and 250 pence respectively.

Advent and Bain declined to comment.

The £6 billion initial public offering is likely to be the biggest in London since the Royal Mail flotation two years ago.

Royal Bank of Scotland was forced to sell Worldpay five years ago as part of its bailout conditions.