Existing ticket holders for the London 2012 Olympic Games are being offered a second chance to take more seats for a limited number of events.

Those who won tickets in the initial first round ballot can buy tickets for football, volleyball and freestyle wrestling from today.

While football makes up the majority of the offering, with 1.5 million tickets on sale, there are also 40,000 volleyball and 8,000 wrestling places available.

Tickets will be on offer until July 17th, with 700,000 potential buyers being sent emails from today.

In total more than 3.5 million Olympic tickets have now been sold, the London Organising Committee of the Olympic and Paralympic Games (Locog) confirmed.

The available tickets for football, volleyball and freestyle wrestling cover 58 sessions and 130 price categories. All other sports have no availability.

A full list of available sessions and price categories have been published on the official 2012 website.

City.Mobi

Also in Europe today, City.Mobi is celebrating the success of its new guide to London.

City.Mobi offers the most comprehensive mobile travel guides available, with over 800 cities in 200 countries listed. Each is developed by the City.Mobi team to combine into a single global travel directory.

However, each city retains its own mobile identity via a dedicated domain. Already on offer are Brussels.Mobi, Paris.Mobi, Sanfrancisco.Mobi and Sydney.Mobi.

London.Mobi is the latest in this illustrious line up, offering click to call functionality – which means no scribbling down telephone numbers.

Most entries are also linked to websites where users can quickly access more detailed information if needed.

Other key features include information on accommodation, restaurants, attractions, entertainment, nightlife, shopping, and transport.

City.Mobi guides include user reviews and traveller utilities such as a translation guide, currency converter, news and local weather guide.