You must be kidding. $100k a year is more than enough to not think about money (for one person) in all European cities, including London. Except if you suck at personal finance and spend all your money for unnecessary things.
When I moved to London I was surprised how low salaries were, even after factoring in social services like the NHS. 100K USD (80,000GBP) is a very good salary there.
1950 called, they want their mononuclear family stereotypes back.