The International Spy Museum has exhibition on Queen Elizabeth I’s spy ring.
Her main spy guy when sending her correspondence from abroad would sign them “007”.
Queen Elizabeths Secret Service running eery sunday night at 10 on PBS
The International Spy Museum... I just tried to surf to their webpage, and as I waited for it to load, a car sped up, slowed down, sprayed the house with automatic weapons fire, then sped off! ;^)
Here’s the best known British spy network from Eliz II’s time:
The Cambridge Five
https://www.spymuseum.org/education-programs/news-books-briefings/background-briefings/the-cambridge-five/