A senior judge cleared of flashing a commuter on a train could face further questioning after two more women have come forward with similar accusations.

Sir Stephen Richards, 56, who brandished a pair of his briefs in court as part of his defence, was found not guilty of two counts of indecent exposure last week.

But the British Transport Police, who were criticised by magistrates at the City of Westminster Magistrate's Court for failing to investigate the matter properly, confirmed yesterday it is investigating two alleged incidents of a similar nature.

The BTP will not comment further - but it is believed the alleged incidents took place on a train between Raynes Park and Waterloo - the same service involved in earlier claims.

One of the claimants, a woman from New Zealand, is thought to have approached police after seeing media coverage of last week's trial.

The other claimant, also a woman, is believed to work in the city.

Officers could question Sir Stephen, from Wimbledon, in the next few days.

The court of appeals judge was accused of flashing at a woman on two occasions on a train between Wimbledon and Waterloo on 16 October and 24 October last year.

During the married dad-of-three's two-day trial presented a pair of his close-fitting Calvin Klein briefs to demonstrate the difficulty he would have had in exposing himself in them.

Sir Stephen, a former King's College School pupil, oversaw the case brought by the family of Jean Charles de Menezes the Brazilian gunned down on a Tube train in 2005 after being mistaken by police for a suicide bomber.