Menu display

Due to an automatic theme or wordpress update my existing menu is no longer displaying correctly, on http://www.londonfolkfestival.co.uk – opening the site a few minutes ago a search box had appeared next to the menu items throwing them out – any suggestions for how I can undo the damage?

I’m using twenty eleven