Firstly alot of courses have entry requirments e.g. GCSE C or above in maths and english or/and a certain amount of UCAS points. Do you have any Alevels?
I'm looking into going to uni myself, I've got a diploma in vehicle technology but that wasn't enough UCAS points for what I wanted to do so I'm hopefully going to be doing a 'Access to higher education diploma' Which is recognised by all uni's. They're for people like me who didn't take Alevels who now wish to go to uni, this course is only a year long as opposed to the 2 years Alevels will take.
http://www.accesstohe.ac.uk/ this may not be ideal for you though becsause it's a full time course.
This is a good place to start: -
http://www.ucas.ac.uk/students/coursesearch/
You can use this to search all the courses available (2011) and all the information on the course - Number of years, entry requirments ect.