When Churchill succeeded Chamberlain as Prime Minister, Churchill brought his own cat, Nelson, with him. These two cats "had a rivalry", which has been compared in the media to that between Larry and Palmerston.
- Craig, Jon (28 December 2016). "Political cats: Who really runs the country?". Sky News. Retrieved 8 August 2020.
- Riley-Smith, Ben (27 December 2016). "Forget Larry and Palmerston, the original Number 10 cat rivalry revealed: Nelson vs The Munich Mouser". The Telegraph. Retrieved 8 August 2020.
- Day, Christopher (2016). Larry, the Chief Mouser and other official cats. Stroud: Pitkin Publishing. ISBN 978-1-84165-761-5. OCLC 983197736.
| Chief Mouser to the Cabinet Office