Virgin Mobile is moving towards a stock market flotation valuing the company at up to £1bn.

The listing of the UK's fifth largest mobile phone group will be the first by part of Sir Richard Branson's empire for 18 years.

Conditional dealings will begin on July 21, with shares given a 235p to 285p price range yesterday.

As much as £279m will be raised by the listing. The money will fund the expansion of the Virgin Group of businesses, which includes airlines, music stores and credit cards.