Finally, after a lot of noodle scratching I decided that rather than put this together myself and risk burning down the house I'd try and find someone who knew what they were talking about electricity wise.
I put the feelers out on boards.ie and got a response from a lad who was happy to take a look at it for me.
And then, just like that the job was oxo. Having gone through the intricacies of the build with the guy there was no way I would have been able to do this myself.
As controllers go it's as basic as it gets, it's just a way to control an element but im very happy with the results.
Here's a few pics of how it turned out.
Cheers.
Sometimes simple is better because it works!
Really nice job and way neater than the control panel I made for my single element, those brewpi element enclosures are the business, I just got two for my future build.