Occupations and class

[King of Kensington]

What class would you put the following occupations in?  Using whatever schema you'd like (middle class/working class, intermediate categories between middle and working class that could take in nonprofessional white collar occupations, petit bourgeoisie or whatever), but provide a justification for placing that occupation there.

Airline pilots
Bookkeepers
Lab technicians
Police officers
Real estate agents
Registered nurses
Taxi drivers
University teachers

[RINO Tom]

Professional
Professional
Professional but depends
Blue collar, though eventually professional up the line
Professional middle class
Professional middle class
Blue collar
Professional

[King of Kensington]

Here's my crack at it.  My schema includes a middle class of professionals and salaried managers, intermediate groups of technicians/associate professionals and the petit bourgeoisie, routine white collar and the manual working class.  The routine white collar group can be considered part of the "greater" working class. 

Airline pilots:  white collar technicians
Bookkeepers:  routine white collar
Lab technicians:  white collar technicians
Registered nurses: middle class
University teachers:  middle class

These are harder.

Police officers:  They're not professionals and manual labor is part of their job.  They're also considered culturally "blue collar."  But police unions haven't been allies of the working class movement and their job has too much power/authority to place clearly in the working class.  I'd put them in the intermediate group somewhere.

Real estate agents:  Clearly white collar but nonprofessional.  They have more prestige and autonomy than the routine white collar group.  Many if not most are self-employed.  Maybe they fit with the petit bourgeoisie group? (the Conservative Party under Margaret Thatcher has been described as estate owners being replaced by estate agents).

Taxi drivers:  A lot of them are self-employed.  I think the Brits consider them lower middle class rather than working class.  A sort of petite-bourgeoisie/working class hybrid?

[King of Kensington]

What's the difference between "professional middle class" and "professional" RINO Tom?