I would not do it. Once you move away from London, you will never be able to move back, especially if you buy elsewhere, because of the difference in property prices and the difference in the increase rate of property prices in London compared to the north. Your children would have uncomparable opportunities in London as regards both studies, culture and travelling. A few extra bedrooms and a garden with a few flower beds is not worth giving this up. Plus chances are by the time your kids are marriageable age, from the price of your London property you'll be able to buy them each, and yourselves a property each up north, if that's what you want.
Ah the words of an uneducated southerner. Please keep pushing this myth so we can keep the riff raff out of the north thanks.
We have this place called Manchester Airport within 15 mins drive of where I live. Its great. Its runway is one of only two in the country big enough to accommodate the A380. Heathrow being the other.
Clearing customs and immigration at Manchester is generally a real joy compared with Heathrow. Everytime I go through Heathrow it takes well over an hour, but I can do it regularly at Manchester in less than 20 minutes. Also since they've done it up, the facilities and shops at Manchester are better than Heathrow in the fact, that you can actually afford to buy things there including the food (May I recommend the pub at Terminal 1. They sell excellent local food and beer and generally piss all over their Weatherstones equivalent at Heathrow). We also have an airport called Liverpool John Lennon, just down the road. It specialises in budget flights and also has the effect of keeping flights at Manchester competitive. The range of short haul flights between the two airports is great - and generally cheaper than flying out of Heathrow. If you want to do budget in London, then it's generally a trek out to Luton. Which adds to the cost of your trip. Yes long haul flights out of Manchester tend to be more expensive, however this is offset by the cost of parking and cost of eating at the airport (a lesson learned from experience). In terms of the range of destinations, there are fewer places that you can get to direct from Manchester. However this is expanding and really doesn't restrict you too much. A transfer to more 'exotic' places isn't really a hardship, and Manchester/Liverpool suffice for the majority of holiday makers. If you want to travel to other places, then tbh, if you can't cope with going indirect then why bother at all. For business travellers there might be a bit more of a case, but honestly Manchester does cover most places these days.
Plus if you live in the North you may well have more disposable income than if you live in London. This means you can afford to travel; whats the point in having an airport that flies everywhere near you, if you can't afford to go anywhere anyway?
So that's travel.
Culture. Let me see. Well, I've seen virtually every band I've ever wanted to see. The M6/M62 corridor is great. I can get to Manchester, Liverpool, Leeds and Birmingham within an hour an a half. London is just over two hours direct. If I live in the SE, the chances are I'd have to get public transport and in most cases it'd take me the best part of an hour to get where I wanted anyway. If I want to do London Museums and Art Galleries, hoping on the train for a day trip is affordable if planned in advance. Plus I don't have the costs of living there all the time. And a small point here, but most of my friends from London NEVER actually did this anyway, and I found myself in the peculiar situation of having been more regularly to see our capitals culture than them, because people have a tendency not to do museums on their doorstep unless they have visitors from outside the area. I also thought that castles and country estates and countryside in general have cultural value in the UK due to the fact that most places tend to have a great deal of history. But obviously because they aren't in a 'dusty museum' in London they aren't important and aren't centres of culture. Only Beefeaters and the Queen count. And the dear old BBC... we'll just forget they fucked off up to Manchester cos its better and cheaper and they realised we sell good cheese up here.
So that's culture.
Education. Well I wasn't aware that there was this enormous educational divide. The league tables tell me differently. I live close to a Science Enterprise Zone which has got shed loads of funding and does a lot to encourage apprenticeships. There's a very good nuclear industry up here which is world leading. Until recently Astra Zeneca had a very big presence here (though admittedly half of that has now gone). If I'm paying a hefty mortgage in London, I couldn't possibly afford to save for their university expenses (not concerned about fees), so they might potentially miss out or I'd have to move out of the capital much earlier than you suggest.
So whilst you sit in London on your 'pot of gold' waiting for it to mature, we'll get on with the business of actually living and enjoying life, travelling, getting an education and making roots so when the time our kids are marriageable (the average age is now 30) we won't have to think about a massive upheaval in all our lives and having to make new friends. And what is the fucking point in having this marvellous education you can only get in London where there are all these opportunities that don't exist anywhere else? Wouldn't that mean you would have to either get your kids to make the 'sacrifice' you are unwilling to do now and move out, or you move away from your friends, family and potential grandkids? The truth is that life in London is unsustainable for many people and businesses, especially if you want a good quality of life, so they are moving out and creating opportunities outside the capital that didn't exist a few years ago.
Lets face it, you are talking a right load of bollocks. The Times (ha!) did 101 best places to live in the UK. The top place according to last years list was Skipton in West Yorkshire. Bristol rated as the top city. I really do hate to piss all over your chips. The question is more why the fuck would you want to say in London if you had the opportunity to move out to somewhere nice elsewhere?
P.S. I like rain. I can afford to go to Spain if I want to. It can be cheaper to get a flight there from Manchester, than get the train to London. That's before I talk about hotel prices... How's that for culture?