Thanks for the help guys, the keyboard itself was simplicity to remove. Just unscrew 4 screws on the back and it lifts off, then just pull the cable out of the slot gently and you're done

And some wanted to charge me £35 for this alone, it took me under 2 minutes
Anyway, I'm in the process of getting quotes for new keyboards. That ebay one looks like it'll do the business, it's quite a relief to have brought the price down from £300 to around £70
Again, thanks for the help. If anyone knows of anywhere cheaper, I'm all ears