London taxi firm Addison Lee is set to make £50m in 2012, through its iOS app alone. The app accounts for a quarter of all bookings for the company.

The apps takings having already surpassed last years figure, of £23m, and should be more than double it by the end of year.

The free app has been downloaded more than 350,000 times since it launched in January 2010, and 45,000 bookings are now made using it each week.

Addison Lee also has Android, Windows Phone and BlackBerry apps – none of which, presumably, even approach the success of its iOS app – and says it is currently assessing the potential of new technologies, including HTML5 and NFC.

“We offer a full range of apps, but our customers have really embraced the iPhone. There have been a slew of copycat smartphone apps for taxi services since we launched, but no company can offer the scale and reliability that underpins our app,” said Peter Ingram, Addison Lee’s IT director. “Addison Lee’s huge growth over recent years has been founded on technology, so it’s natural for us to be at the forefront of mobile transport apps.”