It's true that the comment is invariably made that the south east, and particularly London, gets 'all the new trains', whenever new/old rolling stock is discussed. But it's worth remembering that the main reason behind the vast influx of new electric stock in the region over the past decade was because prior to this huge swathes of southern England were being served by slam door units, which were then outlawed. Whilst the Pacers and earlier Sprinters might be showing their vintage nowadays, they were a generation newer than our Slammers. They, in turn, replaced northern England stock older than the Slammers. It's just a case of life cycles. Would northern passengers have preferred a fleet of Slammers to their newer Pacer/Sprinter units ten years ago?! I think not. The north will see it's ageing diesel fleets replaced long before the southern Electrostar units (now a decade old don't forget) go, and so eventually reversing the current situation, and so on. It's also worth bearing in mind that a considerable proportion of London's local and commuter services are operated by vast fleets of Class 455/456/319 and similar units, which are of the same ilk as 150's. Think of Bristol; one of the biggest economies outside London and not a million miles away, and most certainly not up north. It has a commuter fleet consisting of 143's, 150's, 153's and 158's. No shiny new trains here, and none planned any time soon. The latest arrivals, fresh out of the paintshop, are 150/1's!
So you see, it's not so incredibly biased and unfair after all. Sometimes you'd be forgiven for thinking that whenever a Pendo or 225 got half way up the country it turned round and came back south, and all the 'Northerners' were put on MK2's with a 47/86 on the front!!