": A session had already been started – ignoring session_start() in "

Hi guys,

Noticed recently I keep getting a PHP notice on page-load which says “: A session had already been started – ignoring session_start() in”.

Any idea why why and how I can fix this?
Not only does it show on the page before people see the site content, it also messes with the spacing of the header from the body. Pls see example at: http://www.robinsonslondon.com/contact/

Speak soon,

Chris