I went on an ISC medical course, expensive but very useful, I managed to get 4 offers.
It was great mainly for improving my confidence and for giving easy to digest info about the structure of the NHS etc. and tons of practice questions (which admittedly you could get from a book off amazon). They give you tips about how to presents your answers and a bit of reassurance. As bad as it sounds it was great to meet people who were even more nervous than me!
If you've got the money and the time, definitely go for it.
EDIT: I just saw that you're a reapplicant, definitely do it, with a full time job it's certainly affordable. Did you get interviews in your first application? I met lots of reapplicants on my course.