Thank you all for the replies.
@joueur de guitare
No, I haven't got a multimeter, but I will definitely get one. I can see it would make it all a lot easier.
@shadowscott007
Thank you for the advice, I will do that. It is a Les Paul style guitar, but I'm not familiar with what a long leaf spring is, but I will google it. Thanks again.
@Scooter Trash
I shall purchase DeOxit. So far I've been spraying WD40 into the pots. It worked well on my other guitar, but hasn't cured this guitar. I will get some DeOxit and give that a go (im assuming its a cleaning fluid, I havent googled it yet!)
@12-string_Doug
I will get a Stew-Mac to add to my arsenal of guitar repair stuff. Cheers! I recently got a soldering iron, so I shall check the soldering joints. Thank you.