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The true answer to reinstating the old site depends upon the quality of work done on the many parts of the job by the PR agency.   If this was my site, and it was performing kickass before these PR guys got their hands on it, I would toss the old version back up and do a deeper assessment - because the results thus far suggest that the PR agency doesn't know much about SEO. <kibitz>In the past few years a lot of PR agencies have become spammers who wear suits to work.</kibitz>

Well, pretty much every page on that website is stuffed with internal links. Even a simple blog post has like 50 links to their main and category pages. This page has more than 100 links http://www.cartridgesave.co.uk/toner-cartridges/Samsung/Xpress-SL-C430W.html And they have 19,000 pages in the index, so I'm not surprised they have that many internal links.