Ok great. Just make sure to spot the action when you able to broke it at what point that will help us to spot the cause. If it all goes well - I 'm sure you will be really happy to see that 🙂
I rebuilt everything from the ground up from a completely stripped back framework of what I had originally written and the whole problem was coming from a [wpv-conditional] statement that was wrapping a lot of the View in the third section of the accordion. Having a [wpv-conditional] returning false and not allowing the View to load was basically what the problem was and removing this and correcting a few resulting HTML logic errors has sorted things out.
Quite why Toolset loaded nothing when a [wpv-conditional] statement was failing is anyone's guess but it is not working perfectly and all I can say is if you encounter similar situations when the page just dies at the point a view should load, check your conditional statements as it seems to hold the power to break everything!