I sent in my CV to the recruitment agency who contacted me a couple of weeks later for a telephone interview. I passed this and was offered a face to face interview at the office, once I passed this I then did another telephone interview, this time with E.ON themselves, and was given the job.

Casual interview in a group. Learning about the company before the interview and the role you'll be interviewing for. Includes a one to one interview of around 5 questions. Very friendly and not too difficult