What grounds can a life peerage be stripped?

A life peerage can be stripped on grounds such as serious criminal activity, particularly if the individual is convicted of a crime and sentenced to a prison term of one year or more. Additionally, peers can be removed for breaches of the code of conduct or if they are found to be incapable of fulfilling their duties due to mental incapacity. The House of Lords Act 1999 also allows for the removal of hereditary peers who are no longer able to sit in the House.