0027e29e_British_Museum___Cookies__Purpose_of_cookie
[Cookie name] BIGipServerBM_HTTP_POOL1 BIGipServerBM_HTTP_POOL2 [Expiry] When user closes the browser [Source] britishmuseum.org [Purpose of cookie] 
To record which of our two 'server pools' you are connected to when browsing. To ensure you have a consistent experience as you navigate the site.
British Museum - Cookies
Purpose of cookie