The ‘contact our legal department’ is just designed to put you off. This company was registered in Oct 2009 by http://www.a1companies.com/ an off-the-shelf company formation agency – typically used by one man companies and small outfits. The chances of them actually having a legal department are very slim.
The problem is these links/screenshots are just listed under a section called "Clients". As far as I can tell he is not making any claims to have designed the sites, merely that they are current clients of his.
However, this could be misleading advertising. An advertisement can be considered misleading if it "creates a false impression, even if everything stated in it may be literally true."
Of course, I am not a lawyer. You should try contacting the OFT or seek advice from a qualified legal professional if you think it’s worth pursuing.