During the Olympics, wi-fi access will come to the London Underground system for the first time.

Virgin Media is working with Transport for London to wire up around 80 stations.

The service will only be available on platforms rather than on trains, but it is expected to prove popular with passengers checking up on travel information, sending emails or using social networks.

Technology correspondent Rory Cellan-Jones got a sneak preview at one station where the equipment is being tested.