In the UK the average for a plumber is about £26,000. But this includes London plumbers, and also includes plumbers with extra skills and certification for gas.

Pay for doctors is complex, because you're including FY1 and FY2 and registrars (a bunch of junior doctors) and also consultants and experienced consultants.

Here's a PDF, which appears to be undated.

(http://www.wwl.nhs.uk/library/foi/classes_of_info/whatwespen...)