While the Rough Road Package is not available as an option for the Superb 4x4 estate in the UK, ("why not?" you might well ask...), it is elsewhere in Europe. (Including Ireland, @ €227, therefore its absence from the UK market can't be put down to a LHD/RHD issue).

Has anyone had the rough road package fitted post delivery/purchase?

it is difficult to get the rr pack after delivery because it's not just the extra protection shields from under the car (this you cand find aftermarket easy) but it's also the suspension type witch is higher with a few centimeters.