Got it sorted. I just had a moment of complete worry. Sorry to sound a bit of a...well you know. I'm all new to this forum stuff, and I didn't look at schematics because to me it would make as much sense as a giraffe trying to solve a rubix cube. I didn't even hear of reverse polarity until you mentioned it. Now I know all these things, it's easy to look back and feel a bit stupid. But when you honestly have no idea, it's not something you go looking for, as you don't realise it exists. Thanks for the help though. Just the fact of spending a fortune on a pickup with specialised covers and receiving them wrong, really touched a nerve.
I've just done a lot of research now, and you said you could simply change the wires round? From what I've been told, switching wires isn't the way to solve, as apparantly the entire magnet has to be flipped. Anyways all in the learning curve.
Cheers for the advice though