Yes.
Yes, a US compact disc will play on a UK CD player. There is no region coding on music CDs.
Yes it will, there is no region restrictions on audio CDs
Yes, a UK citizen can work in the US with the appropriate visa or work authorization.
You can play CDs from Europe in a US player and CDs from the US in a Europe player. It's DVDs that don't work due to region codes.
Yes, as a US citizen, you can work in the UK by obtaining the necessary visa or work permit.
Yes, a US citizen can work in the UK by obtaining the necessary visa or work permit.
UK.
No, US citizens cannot work in the UK without a visa.
Yes, a US citizen can legally work in the UK by obtaining the necessary visa or work permit.
If you get the UK work visa then the work permit is not given to US so you need a work permit for US.
A US trained doctor can work in the UK with the proper visa. There are many jobs available in both the US and in the UK for medical professionals.
It will work if you can get a UK power adaptor for it, and if you have a NTSC compatible TV, but you will only will be able to play games from the US, not ones from the UK.