I did get a bit disillusioned (nightmare job) at one point and looked into teaching much to my parents' horror. I found I was limited with my law degree but was told I could do an upgrade course with my languages or teach primary.
The teacher training people run lots of teacher training days so maybe you could see if you can get to one of them? They are good at keeping in touch and still ring me periodically to see if they can get me to do the training as they are in such need of teachers.
As said about you could do a degree in something you really enjoy then do a conversion course or PGCE afterwards should you still want to do law or teaching.
How about some work experience? Do some voluntary work in your holidays like working with children's holiday projects or summer schools.
Law wise it's difficult to give a decent work experience but you could see if they have any office junior positions over the holidays so you can get to meet some people who've been there. Maybe somewhere like the CAB could give you some experience?
This is a good site for teaching...
http://www.tda.gov.uk/
And one here for law...
http://www.lawsociety.org.uk/becomingasolicito r.law
Good luck!