You know, this has really chafed (and I know it shouldn't). The more I analyse the event (and I am that annoyed) I don't remember seeing a wheel balancing machine in the place? I will keep a look out for a decent local source and if anyone knows of a place...
However, (not quite like familyman's journey

) but on Boxing Day, the wife and I drove to Otley (her parents) then to Harrogate (my parents) then to Hornsea (my grand parents, with my parents in the back), back to Harrogate (drop the parents off) then back to Stone.
403 miles, one tank of fuel, empty to empty.
More importantly, parents commented about smoothness of ride, quietness and space in back. I did all that driving and could have done another couple of hours, easily.
In my job, I do a lot of driving in company hacks. This summer I've been at Tilbury power station, 4 hours average drive. Mondeo Diesel, Passat estate diesel, Renault Laguna diesel, Saab something petrol, Vauxhall Meriva 1.6 petrol (Oh dear

) and a BMW320d are a few of the cars I have had. All but the BMW were no way near as comfortable as the Omega. The BMW was a nice car, poorly equipped and not as good a finish as I expected.
I'll stick with the cheap car option I think