In an article for the Lib Dem Voice website, Caroline Pidgeon describes how anomalies in the Oyster card system result in Londoners being overcharged by £500,000 a month when they travel on National Rail services:
This week at City Hall I was accused by Boris Johnson of being a “negative Liberal Democrat” when I dared to question him over some of the problems that have happened as a result of the extension of Oyster Pay as You Go to national rail services across London.
Well I stand by my questioning of the Mayor as there is no doubt that a huge number of Londoners are not getting the best deal that Oyster could deliver. There are serious anomalies in how the system operates, and the full benefits of the technology are simply not being delivered. Most significantly many people using Oyster on the trains, whether they are Londoners or visitors, are being overcharged, sometimes by quite large amounts. This January alone it is estimated that 32,000 passengers were overcharged a total of half a million pounds.