Prototype
Well a few months have passed and I'm able to get back to this project.
I used Eagle to design a PCB, but every time I ran the build it required a double layer PCB and my DIY PCB skills resulted in several coasters ! I've just found one of many stripboard design applications and have come up with the attached. Hopefully it won't need modding too much, and will either update the image when completed and tested, or confirm that I've got it right first time (be a miricle)
I'll also take some pictures of the unit as it's put together and will add them to this thread as I progress.
Note that before anyone jumps in and states that I need to break tracks around the relays, due to the lack of being able to design a custom component, I had to compromise, the real relay doesn't have all the pins on the package as shown
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