I got some bolts today - M10x75, M10x110 and M12x1.5x30. The first pair allowed me to fit the engine mount bracket to the engine.
Unfortunately the gearbox has a lug in the middle of it...
...which can be easily removed!
And the M12x1.5x30 bolts joins the mounts to the brackets that were made by Aeon for the VAG engine/gearbox.
I'm slightly concerned that my gearbox may be a different size to the demonstrators, and I may need to make either a new bracket, modify this one, or create an extension.
Looking at some of the other pictures I took of the demonstrator, it looks all right!