Whenever I teach the Data Protection Act, I expend much energy communicating that knowing about the DPA could be one day prove very beneficial to them (unlike a lot of things they learn). The DPA is widely misunderstood; and it is hugely useful, for example if you should find yourself in the position of being unexpectedly turned down for credit.
Now to this we can also add the fact that the DPA could one day help you out if you become a Doctor and your application for a job is turned down after electronic processing by the infamous MTAS system. This is the story of Dr Palak Trivedi, who used the powers of the DPA to enquire as to why... and got an interview.
Further MTAS horror stories can be found elsewhere on the good Dr Crippen's blog.