mps demand  budget leak  answers ministers have been asked to explain how budget details were printed in a london newspaper half an hour before gordon brown made his speech.  the tories said a large chunk of the budget appeared to have been leaked in what they describe as a  serious breach of treasury confidentiality . the lib dems called for commons leader peter hain to make a statement and said chancellors had resigned over leaks. they were told it would be brought to speaker michael martin s attention. in the commons  tory frontbencher andrew tyrie mp demanded an immediate ministerial statement about how measures had been  clearly  or at least apparently  leaked to the evening standard .  raising a point of order  he said it was  the latest in a long line of discourtesies to this house   as well as a breach of confidentiality. he said:  i can only hope it is unintentional. if it were planned it would be a very grave matter indeed. a previous labour chancellor resigned after he leaked the budget.  hugh dalton resigned after leaking details of his 1947 budget to journalist john carvel  who published them in a london newspaper  just minutes before they were announced to the house of commons. liberal democrat david laws said it was a  very serious matter  and said mr hain should make a statement on thursday. deputy speaker sylvia heal agreed it was  of concern  but said nothing could be done immediately but the issue would be brought to mr martin s attention.