Let's get this right.
Somebody wants to be a flying instructor, is prepared to do the qualifications required to do it under the latest greatest regulatory regime, simply wants to spend a few days helping out at a flying school to see how they work (nothing about flying for free), and waring think's he's undermining the basis of western civilisation. Play fair old chap.
I'm afraid that I'm not able to help AJ1990, but very best of luck in getting some experience, and becoming a keen and capable flying instructor.
That said, if you've got this far, and can potentially afford it, there's much to be said for doing the CPL whilst the exams are valid. It may open up opportunities (such as bits of charter flying within the school you're working for) otherwise denied to you, and does tighten your flying up a bit.
G