Thanks guys, it will be good to get cutting something again.

For the relay Dean, I was looking at the diagram you did in another thread with the transformer cut and the RST/DCM circuit to the VFD - this one:Click image for larger version. 

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This looked to be very close to where I hope to end up, but with my existing ruby probe and touch plate added in.

I don't suppose you have a link to the contactor/coil unit I would need?