To me the issue is not security agencies use Pegasus, but foreign security agents physically assault British citizen in London, MI6 does bugger all.

I’m not sure what I want from our security services, but security sounds good.

Also I wonder if there is a background level of foreign agent activity they accept and how is that related to the police’s paradox of using confidential informants

It is London - hardly surprising.

Nothing will improve as long as Khan is Mayor, and may not even if he is replaced.

Anyway, MI6 (SIS) is the overseas spies, MI5 is the domestic spy agency.