Google Phishing problem

Hi there,

I run a site for my father in law on my hosting account.

jmillerpatternmakers.co.uk

I set it up for them and the young guy that works for them did the rest, but he received an email from Google this morning saying they have pulled the site because they found phishing on the pages. They gave some page examples being the plugin/askimet but there is only three plugins on the whole site, SEO pack, dolly something and Clean Contact form.

Could anyone give me some advice on where to start with this?

Any help would be much appreciated.

Thanks,

Matt