Hi. In general I think the site looks very good indeed aesthetically - clean and professional. However ...
The instant quote tabs seem to be http rather than https but are collecting some of the most fundamental personal data.
The instant quote, loan repayment calculator and smiling couple are a bit too dominant, especially on the pages that are meant to relate to specific topics.
On Firefox, there is a brief overwritten display problem when selecting from the top grey menu.
Neutrality and comparison is great, but the absolute lack of affiliation to any institution (or mention of, say, FSA registration) seems too neutral.
The Google ads at bottom left of each page are inoffensive, but seem positioned to drive business away from your own site to competititors. Yes, I know you'll get Adsense revenue, but is that the primary goal ?
The blog doesn't feel like a blog, it feels like pages of content. Perfectly decent product content, but not blog material.
The blog post on 4th March gives lots of interesting info for US veterans. However, this is a UK website.
The terms and conditions content is still to be added. Same for privacy policy.
http://www.advanced-finance.co.uk/category/finance-news/ is dated August 2009.
The warning footer has a grammar error ("Some loans ?are? secured") and a punctuation error (final full stop).
Incidentally, your standard grey footer at SEO Positive Ltd (capital L) should refer to London Office, not London Head Office).
So, in general I think the site has a clean and professional look-and-feel, but I think there are various factors that mean there are credibility gaps for the consumer using it.
Hope that helps,
David