Hi,

I had a quick look and yes there are a few problems you need to fix.

I had a look at your links direcory and found three banned sites; it's not normally a good idea to link out to sites that have been removed from Google's index.

I found three in a few minutes, but you should check for more.
www. for-sale-online .net
www. anti-spam-software .com
www. 1stlogodesign. com

Yes, you have a lot of pages that have gone supplemental; I had a look at a few and it seems you have a broken include script eg:
http://www.london-displays.com/exhibition_signage.php

You haven't given us any other information about your seo work on the site; but I'd fix those problems and see what happens.

Cheers,
Paz.

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10.3 million entries for Hotels in Turkey but I'm still chipping away.