Booker is planning a big push on its internet business to include a mobile phone ordering service, after web-based sales more than doubled from £44m to £109m in the last year.

"Sales on the site have increased to £109m but this is just the start," CEO Charles Wilson said.

A "handful of customers" are currently trialling internet access to Booker's website through mobile phones, said Wilson, and Booker was also testing community websites as a means of reaching its diverse customer base.

Booker was also planning to roll out its Extra format to the majority of its depots, following positive customer feedback, Wilson said. Some 34 stores had been converted, with 30 more planned.

This week, Booker reported a 27% increase in pre-tax profit to £36.2m for the year to 28 March on sales up 2.3% at £3.1bn.

Like-for-like sales to caterers rose 2.2% during the year but sales to retailers fell 1.5%, primarily due to last year's smoking ban.