Critics say practice risks perception that members of House of Lords are exploiting role for personal gain

• Revealed: how members of House of Lords benefit from commercial interests
• What is the House of Lords and what do peers do?

Ninety-one members of the House of Lords have been paid by commercial companies to give political or policy advice, amid concerns that their activities are not being properly regulated.

Analysis by the Guardian shows that more than one in 10 peers have taken payments from businesses such as lobbyists and companies operating in the banking, defence and energy sectors. Peers can earn tens of thousands of pounds a year for such roles.