**** facilitating subjects and supposedly soft subjects. They put facilitating subjects out to pasture years ago. And frankly as long as you have the subjects you need, unis won't really care about the others as long as you have the right grades.
For law, anything goes, subject-wise. So if you think Sociology looks more fun, go ahead and do it. Russell group unis couldn't give a rats arse which one you pick so it's all down to you. Which one interests you more? Which one do you think you'll do better in?
I think you've taken more of a liking to sociology.