After what I understand was an epic session of endurance swearing last night the subframe is off the car.
I had some spare minutes out at the barn tonight, so the engine mount came off and the new rear mount went on:

Then I went for a wander among what has been christened 'the engine maze' until I found a CDA gearbox and whipped the mount off that. After cleaning the threads up on the 1.8T gearbox the mount bolted straight up.

So it needs the front mount adding and the old gearbox mount removing.
Then it wants offering up on the G3 subframe, into the bay and test fitting.
Rod-change mech needs to come out, sharpish, Dave. Cable-shifter needs to go in.