I would think it should be in a region of over £100k in the uk.
it depends if they are working as a doctor or driving cab
Amazingly little. Ph.ds rarely make significantly more than people with masters degrees. I have an MBA and my husband has a Ph.d, and I've often made more than he does. Having a Ph.d puts you into a niche that's hard to get out of, and people who get one usually want to either teach or do research. They normally get one for their own self-gratification... not the money. Paying back the school loans is usually NOT worth the effort unless you have something specific in mind that you want to do something that requires one.
A very broad range of incomes...a veterinarian may make less than $100K,<br />
a college professor $150 - $250K. A general practice country doctor $150 - $300K<br />
a surgeon $300 - over a million. A published surgeon that has invented life saving devices $1 -$? millions...