No, not yet Richard. Quick swap of the 30A 'spare' fuse into all of the likely positions on the fuse board didn't help. Back down with the car in a couple of weeks. Will go armed with spare key, uprated fuses, spare relay and a bit more patience.
Shame the fuse box map doesn't look entirely like what's inside. If anyone has a photo of the 'Max or other late Aero fuse box with the starter motor fuse/relay marked that would be really handy. Just to clarify, they are shown on my map as an item distinct from the other fuse/relay arrays, but there is nothing in the box in that position.