Have you not been paying attention to the Snowden leaks? That was years ago, and proven a fact at the hardware level even before the leaks.
For the record, I moved out of the UK in response to the UK government’s response[1] to the increased encryption that was a response to Snowden’s whistleblowing.
[1] https://en.m.wikipedia.org/wiki/Investigatory_Powers_Act_201...