The Ministry of Defence has strongly denied claims that UK army chiefs in Iraq wanted more troops to help stop bomb know-how crossing from Iran.
UK generals in Basra have said advanced technology from Iran has been used to kill British troops in southern Iraq.
On Wednesday, Tory MP Patrick Mercer said British commanders in Basra had asked for more troops so they could seal the border with Iran.
The Ministry of Defence said the claim was "absolutely categorically untrue".
A spokesman said no such request had been made - if it had it would have been carefully considered and the troops provided.
Mr Mercer, a former army officer, also raised the issue at prime minister's questions.
Tony Blair said military chiefs did not think more troops were needed.
http://news.bbc.co.uk/2/hi/uk_news/politics/4443122.stm