Hypothesis...

After reading some source material and conducting some research online, i think that i am going to change my hypothesis slightly to something along the lines of:

How has the repesentation of the British police force changed throughout the years and what is it that makes this genre so popular?

Possible shows to use:

DIXON OF DOCK GREEN [50's]

Z CARS [60's]

THE SWEENEY [70's]

JULIET BRAVO [80's]

THE BILL [80- ]

SPOOKS? [00-]