The door to an offshore career, unless you want to remain a co-pilot. Even if you get a CPL and then do an IR, that isn't sufficient for the issue of an ATPL. Which means you cannot be commander of a multicrew helicopter.
So if by a twist of fate you were fortunate enough to be picked up by the North Sea in your first 3 years, or decided to do an IR instead of an FI, you cannot get an ATPL (you would have a CPL/IR which is different). This will obvious severely hinder an offshore career, and may even preclude you being picked up by the offshore industry in the first place. Unless of course you are happy to return to the books and do the 13 exams at a later date.