I didn't study law at Reading but I know a few people who did.
In terms of contact hours, you're probably looking at 15-20 hours per week in 2nd and 3rd year. This is quite typical of arts and social science degrees. Science degrees are typically more.
From Ash Vale that's about 20-25 miles right? Perfectly doable, but whether you want to commute or not is a different question. Personally I felt the university experience is a lot more rich living with your friends in halls / student housing.
In terms of work load, it's going to be pretty heavy. Lots of essays and reading to do, this goes with any degree you study though. Especially heavy in third year, and that's expected. If you put the effort in, a 2.1 is achievable. A first, however, is very difficult in a subject like law.