SEO advice for a food business in London

We are a high class food business in London looking for SEO advice for a short project - to audit our current online presence then suggest best next steps in terms of link building, ranking, keywords etc. We recently launched a new website, but would also like advice around other sensible steps in order to make us as visible as possible to potential customers. This would likely be a one-off consultation (half a day's work?) rather than an ongoing gig. Once we have identified some potential candidates, we will be in touch to give you more detail on the work we do ...