A senior Metropolitan Police officer has apologised to the Home Affairs Committee on 25 January 2011 after previously giving incorrect evidence on the use of undercover police officers during the 2009 G20 riots.
Commander Bob Broadhurst has previously said that there were no undercover officers deployed, a statement later discovered not to be correct.
He told MPs that "at the time I made the comment it was true to the best of my knowledge" but admitted that cover police officers had been used without him being told.
He said a review was being undertaken to establish why he was not informed, or to find out if he had not asked the right questions.
The committee also took evidence on government policies on equality issues, and on the role of the Child Exploitation and Protection Centre (CEOP).
Equalities Minister Lynne Featherstone denied that equalities issues were being downgraded, but admitted that the ministerial group on equalities had only met "two or three" times since May.
She was accused by Conservative MP Lorrain Fulbrook of only focusing on gender issues, a claim denied by Ms Featherstone.
In November 2010 the government decided to scrap part of the Equality Act 2010, claiming that new laws were not needed to come up with policies to "protect the vulnerable".
MPs took evidence from Peter Davies, the new head of the Child Exploitation and Protection Centre (CEOP), on plans to make it part of a new National Crime Agency (NCA).
The former head of CEOP, Jim Gamble, has suggested that changes could put the lives of children at risk, by bringing it under a new "FBI-style" agency.
However Mr Davies said he did not envisage any of CEOP's functions "ceasing to exist".