No - a British citizen is automatically entitled to work in the UK
If you're not a British Citizen, you will need to apply for a work permit first.
If you're not an EU citizen you will need a work permit.
Is is not very easy to get a permit
As far as I understand it, anyone who is not a Canadian citizen/immigrant/permanent resident, you need a work permit.
Yes, as a US citizen, you can work in London. However, you may need to obtain the necessary work visa or permit to legally work in the UK.
A US Citizen would need a work permit to live and work permanently in the UK.
Your problem isn't getting a job. Your problem will be getting a work permit if you aren't a British or EC citizen.
That depends on where you are moving from. If you are not an EC citizen, you will need permission to stay and a work permit.
No, citizenship is unrelated to a work permit.
no
Yes, a US citizen can work in Germany with the appropriate visa and work permit.
Yes, if he wishes to work legally.