Published on Thursday, November 5, 2009 by Rajul Chande
The Oyster system has made a big difference to London's underground tube system.
An Oyster card allows you to use most of London's public transport network (though a few stations remain outside the system).
It lets you bag discounts on the standard fare as well as allowing you to avoid the inconvenience of queueing for tickets.
The system automatically saves you ...