"given there is little or no manufacturing, industry, or really any other significant employment in the area, I am left wondering just how it is all paid for."
Public sector salaries are not paid for by future taxes but by taxes that are being paid now.
Examples of what will be paid for by future taxes are our pensions and the NHS staff to look after us.
Some areas are net contributors of tax, they pay more tax into the "pot" then the Government spends there.
Some areas are net consumers of tax, they have more tax spent there then is taken.
So all those Government employees in one area are funded by tax paying non-Government workers in another area.
It should be clear that it takes more than 1 person to pay enough tax for the Government to then use that tax to pay for a state employee.
So having 50% of people in Government Employment is clearly not going to work.
What percentage does work is a very good question....