I wouldn't do a year again just because my frienRAB (same people I'd known since primary school) were in my year, so it would have been weird without them, different timetables and stuff.
I did Psychology and its interesting, but its mostly just memorizing case studies.
If you want to do either English or Psychology at uni you'll need to do them at a level, and probably do well in them (at least in order to get into a better uni), but not Law. Law at a level isn't required at all, but business or economics would be helpful.