Lobbying: Parliament security passes to be reviewed
4 June 2013 Last updated at 10:35 BST
Commons authorities are to review 80 Parliament security passes following recent revelations about lobbying, the BBC has been told.
Three peers and an MP have been accused of agreeing to do parliamentary work for payment, with the government promising reforms by the summer.
The House of Commons Commission will begin a "validation" of passes issued by all-party groups, a source said.
Chief political correspondent Norman Smith explains how lobbyists are currently getting passes from a huge list of all-party groups - on subjects including bingo, beer and bees