I'm going to take the opposing position. And for the record I was born in the north and lived/worked in the south for years.
London's probably one of the most successful and richest places on the planet, it's only rival on the global scale is New York. The only part of the UK that actually has a net contribution to the countries finances. Why take this money away and spend even more taxpayer money on useless vanity projects in the north that will have little benefit? London has been successful due to the entrepreneurial mindset and the willing to graft hard, not by sitting around blaming Thatcher for the last 40 years. Just like south Wales there is an atmosphere up here of blaming London and the SE for the regions own failings in adapting to the changing world. Manufacturing has gone. Heavy industry has gone. Mining has gone. Man up and start paying your own way instead of trying to live off of subsidies from the productive and profitable SE.
If you actually read the Kerslaw reports you will see that initally London was chosen as the most favoured recipient of central govt investment. The hope was that this would create a trickle down effect to that would help out other regions.
This did not happen, but the continued tax payer funded investment in London did, and to the detriment of other regions. If you go back not long before the 80's you'll find that London wasn't the golden calf that fed the countries finances, but the industrial midlands and upwards were.
It was only since the de-industrialisation in the 80's (and there were many reasons why this was inevitable) that London began to turn into what it is today.
It's not about Thatcher as politicians of every hue decided that London was the way to go. Just ook at how Labour has switched its focus from the working class to minorities and other urban based groups.
Yes, London is sucessful now, but it is (largely) at the cost to other regions, and this was done in no small amount via the spending of public finances in a whole swathes of areas such as transport, the arts and public facilities.
Your answer does seem to be made soly of 'keep govt spending in London as I live here and it's nice and the rest of you will just have to visit, and oh, btw, keep paying for this for me please'.
It's not about blaming Thatcher (she did what was needed to be done), but that lack of almost any kind of investment for the north over many different govts. They simply didn't 'get it'.