Ok, so a bit more adventuring resulting in me getting curious about how event binding worked, so I believe I have it working how it should 
In the Button blueprint, I have an event dispatcher called “Was Used”.
I then drag this function into the blueprint graph and chose “Call”.
That is all I needed to do in button.
Here is a picture to show you what I have done, but first i’ll try and quickly explain the Generator class.
Basically I cast the child components to a Button (had to untick context sensitive in context menu), then from the object output on the cast node, I dragged the a “Bind event to Was Used” node. Which I then dragged the red binding link to the appropriate event inside of the Generator blueprint. (That probably didn’t make much sense, so here is what I mean :P).