Ideas like this have a habit of suddenly turning up, sometimes generating a little bit of debate, before vanishing again.
After ten years of Labour government pretty much doing that on a daily basis we should be used to it by now
I don't necessarily have a problem with weighing figures; however I think in some regions it will be damaging, particularly in areas of the country where commuting relatively short distances can transport you into a different county or region, this could affect the job market and damage communities, (I would imagine if a job in Bristol paid you £1 an hour more than a job in Newport, I'd cross the Severn) though providing a 'poisoned chalice' incentive for McJobs in the north.