This used to be a fantastic institution. Sadly it appears to have gone the way of many focusing on process over humanity. If you can at all spare the time do not use the OU. If you have absolutely no choice then go in with your eyes open, For the lack of support and lack of quality and availability of tutors you are much, much better studying yourself.
Despite being an online university, the staff are very supportive and give exemplary feedback that really allows you to learn and fulfill your potential. Tutors have an understanding of the needs of mature students who are working full-time and studying simultaneously. The books and online study materials are of a very high standard. I am very proud to be an OU student and would recommend it over any "brick university" that I have previously attended.