We've done age, what about the other questions? This one's less intrusive that annual income...
Definitions of NRS social grade are
here if you don't know them. Basically:
A - upper middle class, e.g. doctor, barrister, lecturer, financial banker, company director, media consultants
B - middle class, e.g. teacher, accountant, librarian, middle manager, solicitor, police supervisor
C1 - lower middle class, e.g. lower civil servant, sales person, police officer, nurse, supervisors
C2 - skilled working class, e.g. machinist, electrician, carpenter, plumber, bricklayer
D - working class, e.g. manual workers, shop worker, machine tool operator, assembler, apprentices
E - underclass, e.g. casual labourers, state pensioners