THE Conservatives last night questioned the behaviour of the government after Stephen Byers, the former transport secretary, admitted not telling the truth to MPs about the timing of discussions concerning a possible change to the status of Railtrack.

Mr Byers - who was giving evidence in the High Court yesterday in the case of Railtrack shareholders who claim he allowed the rail infrastructure to fail to avoid paying compensation - agreed that he had given an untrue answer when under parliamentary scrutiny.

Faced with evidence that his responses to the House of Commons sub-committee did not chime with the correspondence from his department, he accepted that he had not made "an accurate statement".

When it was put to him that he had deliberately misled the committee, he replied: "It was such a long time ago, I cannot remember, but it is not a truthful statement and I apologise for that. I cannot remember the motives behind it."

Keith Rowley, the shareholders' QC, said: "I suggest there was a clear strategy, developed by you and your officials, accepting that Railtrack would not immediately collapse but might fall over in a year or two, to force Railtrack into administration by ensuring you held all the cards and all other options were closed off."

Alan Duncan, the shadow transport secretary, said: He said: "If, as it seems today, Stephen Byers lied to a parliamentary committee, not only is that a disgrace in itself but it shows that their plans for Railtrack were deeply devious and could be a scandal of enormous proportions. Whatever happens in court, this issue is not going to go away."

Mr Byers has consistently denied forcing Railtrack into insolvency to avoid compensation payments but about 50,000 shareholders disagreed and have taken their case to the High Court. They are demanding pounds -157m in compensation.

The shareholders' barrister produced documentary evidence, including e-mails and notes from Department of Transport officials showing that taking Railtrack into administration had been one of the options being discussed as early as June 2001. Mr Byers had told the Commons sub-committee he was not aware of a change in Railtrack's status being discussed before July 25, 2001.

He told the court he had been under pressure during the hearing and had not set out to conceal any conspiracy or plot.

At the time, he said he had tried to "behave honourably", adding "the people that know me best know I am not a liar".

Mr Byers told the High Court the Treasury had concerns about ending Railtrack and removing the role of shareholders. He revealed that Gordon Brown had a list of 10 conditions to be met before he would agree to Railtrack being changed to a non-shareholder company. The list was internally nicknamed "The Ten Commandments", he said.

At a meeting on September 19, 2001 - three weeks before Railtrackwent into administration - Tony Blair told Mr Byers he had to talk to the chancellor if he wanted more money to fund the company. But the court heard it was left to Mr Byers to decide whether to take the company into administration - subject to the Treasury conditions - if the chancellor decided to refuse Railtrack's request for more money.

Mr Byers said he had worked with his officials to see if the Treasury conditions could be met.

But Mr Byers replied that his discussions with officials were "sensible contingency planning" in case it was decided to refuse to give the company more funds.