Is the current law cruel? Campaigners argue that the rules prevent the sickest people in society from ending their lives with dignity and compassion.
MPs get free vote on assisted dying
Choice: Labour MP Kim Leadbeater (above), who is putting forward the bill, says "now is the time" to hold a fresh debate on assisted dying, after MPs rejected a bill on the issue in 2015. Glossary
assisted dying - helping a person to end their life