"There are a great many of these geezers who don't do much at all. We probably only need about 400 legislators."
How the House of Lords looks now, by party
Mr Johnson, however, refused to say whether he would accept a peerage himself if the opportunity arose in the future.
A Cabinet minister warned last week that peers could be forced to leave the House of Lords when they get too old in a bid to ensure the second chamber does not "keep growing indefinitely".
Writing in The Telegraph, Baroness Stowell, the Conservative leader in the Lords, conceded that the second chamber needs reform in the wake of Mr Cameron’s decision to appoint more peers.
Baroness Stowell suggested that “age or term limits” could be brought in to ensure that the House of Lords “commands legitimacy”.
The House of Lords is now the world's second largest legislative body after China's National People's Congress.
Some of the new peers
Conservative appointments include:
Labour appointments include:
Liberal Democrat appointments include: