Spot the Bias

There I was whiling away 10 minutes this evening filling out a YouGov survey (only four and a half years to go before I receive my £50 cheque!) when I came across this question: Which of these best describes your job title?.

The options were:

Owner/partner/proprietor
Chair/President/Chief Executive Officer
Managing Director
General manager
CFO/Treasurer
Chief Operating Officer
Chief Information officer
Chief Technical Officer
Other Chief Officer
Director/VP
Head of Department
Other senior management (please specify)
Other management (please specify)
Professional (accountant, architect, lawyer, teacher, etc)
Government Official

Hmmm, something's missing from this list of occupations. Call me nitpicky but I see no options for the millions who work in low wage, low status jobs, nor the legions of middle-ranking administrators, factory workers, shop assistants AND the 2.5 million unemployed.

How can Yougov write off over half the population and *still* be widely regarded as reliable pollsters?