If your definition of authoritarianism is ubiquitous video surveillance you'll have to come to terms with the fact that not only every politician is authoritarian but just about every citizen, because there's pretty strong support for these security measures.

The word authoritarianism appears to have lost all meaning in internet circles. What authoritarianism actually is, is a people being governed without their consent by a government they did not elect. If British citizens, or their representatives decide they put significant value on public safety rather than privacy that's a choice.