The Sunday Times has released a recording of Lord Taylor of Blackburn, one of the peers accused of taking cash to change legislation.
He reveals some companies have paid him up to £100,000 a year.
Reporters from the paper made the recording by posing as lobbyists working for a foreign businessman.
They also approached the former energy minister Lord Truscott, the former defence minister Lord Moonie, and the former Labour whip, Lord Snape. All the Lords deny any wrongdoing.