Thanks all, I would like to try soldering, but I don't want this to be my initial job for fear of breaking it completely! I'd rather sell it working, but in need of repair.
But, I took your advice and searched around locally. Turns out there is a bloke 30 mins from me who is handy on the soldering iron and knows how to fix this issue. This is what i'm told:
"it's relatively easy to fix, you can just solder across the break but this may break again, or the permanent fix is to solder a piece of wire from the switches solder joint to the next solder joint in the circuit."
He will repair for a beer too, not £40 haha
Let's see how it goes!