Finally someone else who isnt doing a science subject at A-level.
I would say do the second choice because i dont think psychology is respected enough to get into a good enough Uni. English lit is respected more that english combined so that would probably also be better i think.
For law the most helpful A Levels to do are History, English Luerature. Psych is also good. However it is NOT essebtial to do Law (althoguh you will have a head start) but most uni's like teaching you afreash at degree level.
6TH FORM VS COLLEGE? go to the one that has the best pass results