New Look Menu

I've changed the menu on the website from a side bar to a horizontal row at the top of the page. Please have a look and see what you think. My only 'concern' is that the menu disappears when you scroll down the page (the side bar was fixed and the age scrolled underneath it)

I'd welcome your comments on this and any other design elements on the site. I'm always trying to keep things fresh, but, like they say 'if it ain't broke - don't fix it'

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