I'm just finishing mine. I think you're asking a big question which could actually be broken down into different things, some of which (in my personal opinion) are decisions that are completely personal to you.
Although different study centres will have different teachers which obviously affects the quality of the education you receive, before you do that, you need to choose your method of learning; long distance or classes. long distance is more flexible but requires you to be more self motivated, do more reading etc. Classes will potentially give you more guidance but have more structure in place.
After that decision, choose your institution - if you go for classes, you can go to university which is academically focused or go to professional institution which will be more work place orientated.
If you go for long distance, you'll be looking at professional institutions. Talk to different providers about the types of material they have, online support, tutor contact, peer groups etc.
Finally, once you've decided what method (classes or long distance) you want to go for, clarify the costs and put this to your company. Some methods are much more expensive than others - if you are sure your company are paying for it entirely this is less of an issue, but if you have to put up even some of the funds or even if you just have to take responsibility for any reading materials, do look into this - I've gone the university route and spent about �300 is text books alone.
Because learning styles are so personal, I think you have to figure out certain things for yourself and once you've maybe got a short list of a few institutions, try visiting CIPD.co.uk message boards and asking people for their experiences about these particular instituions.
You could start (if you haven't already) with www.cipd.co.uk where you can get information about institutions in your area (you type in your