Vicky Pryce's barrister Julian Knowles QC has asked for leniency, saying: "She has already suffered considerable punishment as a result of accepting her husband's driving points 10 years ago."
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England have won the third Ashes test by one wicket, levelling the series at 1-1.
Forecasts have tipped the mercury to climb closer to 33C as the weekend goes on.
A warning shot was fired into the air by police after they were attacked by a small group of protesters.