Some of my parts came today, including the relays. Although, it wold appear that I have made a slight error - two of the through-holes on the board are too small for the relay pin, and upon further inspection the same goes for the screw-down terminals.
These errors have now been amended on the files hosted both locally on this Hackaday project and on GitHub.
Unfortunately, with some of the parts not fitting, I will have to order the boards again unless I can bodge it somehow. I think i'm going to try and file down the pins so they fit, I that doesn't work I will just have to order again.