We have compiled below a list of the UK's most credible and useful resources to enable you to learn all about SEO, SEM and related subjects. This is really all you need; 

SEO Moz
A superb hub of SEO information, tips and very practical advise, visual examples run by SEO celebrity Rand Fishkin. Although US orientated, this is an excellent resource
www.seomoz.com

E-Consultancy
Although a general digital website for the UK, this site has excellent information about SEO in the UK. They publish a very well respected and thorough SEO user guide as a very interactice and vibrand forum on SEO.
www.e-consultancy.co.uk

Search Engine Land
Search Engine Land is a well respected hub for news and information about search engine marketing, optimization and how search engines such as Google, Yahoo. Run by Danny Sullivan the former owner of Search Engine Watch. Content is very up to date and useful
www.searchengineland.com

Search Engine Watch
Not as authoritive or visible as it once was but still has very credible news content and up to date information
www.searchenginewatch.com

Useit:
Jakob Nielsen's superb alertbox, reports and books on usability and SEO.
www.useit.com