Nonsense.
According to recent figures, more than half of UK transport investment is in London; London gets 24 times as much spent on infrastructure per resident than north-east England. In other words, investment leads to growth.
Your insinuation that people is some areas might be less hard working is insulting and wrong.
Britain is the most over-centralised economy of any developed nation. Shift power and money out of London and we would have a better balanced nation with wealth and opportunities spread more evenly.
The problem is that to improve capacity in (for instance) Manchester the TOC's could buy some more trains (£0 infrastructure cost) even if some platforms need lengthening is shall change compared. Whilst to do so in the South East would be much more costly. As a lot of trains (at least in the peaks) are full length, so longer trains are not normally possible. As such new lines/junctions, etc are required which have a significantly higher cost.
In London to get to 240 million passengers you just need to look at the three biggest strains (Waterloo, Victoria and Liverpool Street) to get to a similar number of passengers from stations outside London and the Southeast you'd need about 15 (Glasgow Central, Leeds, Manchester Piccadilly, Edinburgh Waverly, Glasgow Queen Street, Liverpool Central, Liverpool Lime Street, Cardiff Central, Cambridge and Bristol TM which is 10 strains and gets you to about 200 million and then each station after that is less than 10 million passengers, meaning probably 5 more stations but could be one less or a few more to get to 240 million).
If you look at passengers in excess of capacity only one non London station equals or betters any of the 9 busiest stations in London. Manchester comes in at 3.0% effort the lowest of the 9 London strains is 2.7% followed by 3.1% and the average London value is 4.5% compared with 1.7% for non London cities (these figures are based on both AM and PM 3 hour peaks).
Both of these should give an indication of how many passengers the London stations deal with and how much busier the trains are. Which is why making improvements is much more costly.
It should also be pointed out that if some of the sitter train companies received the same level of subsidy as TPE then they would be able to fund massive improvements to their networks.
As such if the north is to get the same level of infrastructure (NR spend) increment then it's only fair that the southern TOC's get the same level of government support as the northern ones. If that is not to be the case then the overall level of government spend (TOC support and NR spend) should be considered, which to date hasn't been considered.