It seems that the London Cycle Hire computer systems have been on the blink, and some users have been charged for journeys they never made, according to the Standard.
Erroneous fees of up to £300 have been made. So check your statements.
Financial error is the cardinal sin of the IT world. You can get away with a clunky website, downtime and delays, but wrong charging is guaranteed to hole customer confidence below the waterline. Serco need to get a grip, and fast, but the final responsibility rests with TfL, who have some serious questions to answer.
On the plus side, these involuntary donations wouldn't have done TfL's budget any harm...unfortunately Serco has had to pay compensation to the victims.