Secondly, law at uni is not 'a bit more vocational' - it is a purely academic discipline until you choose your career path. Writing about you want to do law because it is a vocational course will see your UCAS application binned in record time. If you want a vocational course, take business.
As for the content of a law degree there are 7 compulsory moduels (if you want to become a solicitor/barrister which I guess from your vocational reference you may wish to be) which, at this stage, you can probably guess the basics of but have no idea what they actually contain at degree level. They are:
Contract
Tort
Constitutional
Land (property)
Criminal
European Union
Equity and Trusts
Then you typically have a chocie of a variety of options to fill up the rest of the thre (or four, with a language) years (although the third year would probably be abroad anyway). Typically you get a choice of such things as company law, insolvency etc. but also options such as mental health law, legal theory, some policy related modules and the likes of dissertations. Basically, you can take a combo of whatever takes your fancy, so at the time you can say "what do I prefer? what am I likely to do well in?" and choose accordingly between black letter, theory, policy and dissertations.
Good luck with the application process.