Honey bee's are not native to Britain, and are not in any danger of disappearing because, like chickens, sheep, cows, and other livestock, we control their population; when demand or price of honey bee's is high beekeepers produce more, when it is low they produce less: https://www.acsh.org/news/2018/04/17/bee-apocalypse-was-neve...
Not sure how you came to that conclusion after reading that article. It states that honeybees (Apis mellifera) possibly originated in Asia and spread to Africa and Europe about 300,000 years ago.
The greater issue here though is that if honeybees are affected, there are likely many other bee species and insects that are affected that we _aren't_ protecting.
I don't know specifically about Britain, but most bee species are solitary, and without a hive, they're not as vulnerable to disease, or poison transferred back to their home. Other types of bees accidentally exposed would likely only die themselves, not quickly spread it to and kill other populations.
2nd sentence of 2nd paragraph says: "honeybees, which are actually not even native to North America, Europe or Australia"
guess it depends on how you define "native"
Additionally, it is likely that honeybees are native to Britain: https://www.researchgate.net/publication/250278609_Are_honey...
The greater issue here though is that if honeybees are affected, there are likely many other bee species and insects that are affected that we _aren't_ protecting.