Where can I take Cisco Exams

Hello, I live in the UK and last year graduated with a degree in computer science. I have found that my degree has meant little in the real world, especially when applying for jobs, and have therefore decided to seek certification. Since networking is where my desired career lies, I have decided to study for a CCNA. I have however looked at literature and have found that much of the material is very close to that I have covered in my degree. Can anyone advise me as to where I can go to take theexam on its own. Although I do intend My employers will not help fund me through this, so the cheapest method possible is the one I am going to follow.