Comprehensive advice
Good resource with LOTS of information so if you can afford the time it is worth exploring the stuff these guys provide:
http://targetjobs.co.uk/general-advice/interview-techniques.aspx
Interview preparation
http://www.prospects.ac.uk/cms/ShowPage/Home_page/Applications__CVs_and_interviews/Interviews/Preparation/p!eplFbj
Making a good impression
http://www.prospects.ac.uk/cms/ShowPage/Home_page/Applications__CVs_and_interviews/Interviews/How_to_impress/p!elpgeg
http://www.get.hobsons.co.uk/advice/interview-job
Types of questions you can expect
http://www.prospects.ac.uk/cms/ShowPage/Home_page/Applications__CVs_and_interviews/Interviews/Interview_questions/p!ejimac
http://www.get.hobsons.co.uk/advice/interview-sample-questions