Rt Hon Keith Vaz, chair of the Home Affairs Select Committee, has called for a "clear code of conduct" for police officers operating undercover.
He told ITV News that cases of undercover police officers fathering children with their subjects, or using the identities of children who have died, were "abhorrent".
"This isn't James Bond, this is happening," he added.
More top news
The Prime Minister and the Leader of the Opposition praised the courage of Britain's armed forces in a Christmas message to troops.
Nick Clegg has vowed to avoid appearances on reality shows like I'm a Celebrity Get Me Out of Here! when he stands down as an MP.
Immortalised in the film Zulu, the Battle of Rorke's Drift is an iconic episode of British military history.