Yes UK fiscal situation not good also the GBP not good it's been falling against gold btc and other currencies steady.
That's true, but there is England and then there is LONDON the London don't care because there is more wealth then in some countries.

Im sure there is money for everybody and more consumers then actually service providers even expensive private cars with private drives got a lot demand of customers.

But let's not just talking i did some research to show the numbers so let the money do the talking:
I used AI to get info together here is the results:
To calculate the theoretical distribution of wealth in London, we need to gather data on the total wealth held in the city, the population size, and then perform some calculations. Below are the steps involved in this calculation.
As of recent estimates, London’s financial sector is one of the largest in the world. According to a report from the City of London Corporation, as of 2023, the total assets managed by financial institutions in London exceed £9 trillion (approximately $11 trillion). This includes cash deposits, investments, foreign currencies, and other financial instruments.
The real estate market in London is also significant. The total value of residential properties alone is estimated to be around £1.5 trillion ($1.85 trillion) as of 2023. When commercial properties are included, this figure rises significantly.

In terms of cryptocurrency wealth, while exact figures can be challenging to ascertain due to market volatility and privacy concerns, estimates suggest that UK residents hold around £200 billion ($250 billion) worth of cryptocurrencies collectively.

Combining these figures gives us an approximate total wealth for London:

Financial assets: £9 trillion
Real estate: £1.5 trillion
Cryptocurrency: £200 billion

As of 2023, the estimated population of London is approximately 9 million people. This includes both residents and non-residents who may work or spend time in the city.
Calculating Per Capita Wealth
To find out how much each person would receive if all this wealth were distributed equally among the population:

Based on these calculations:

Each resident and non-resident in London would theoretically receive approximately £99,074.07 monthly if all wealth were distributed equally among them based on current estimates of total wealth in London.

The numbers might not very accurate but it gives idea why London don't need to worry about rest of the UK, They got their own tax system own Schools and own police and healthcare hospitals and a lot rich foreigners where the line of residents and non-residents is blur If you in London that's not UK because London be self sustaineble even all uk collapse because there is enough wealth to keep this city good not just UK GBP but a lot foreign currencies and a lot debit cards transactions trough various of business transactions.
So London could very well be Independent city apart of england the London is London and rest of the uk is rest of the UK.