Yes, they do. The Vanguard class SSBN is the Brit launch platform, part of our NATO partnership.
This provocation is a big, effing deal. They are baiting a response. Question is, did the Brits scramble fighters? Have to read full article.
Yes, as the RAF has been doing since the 1960s. The frequency of these incursions has been building gradually over the last few years. The difference this time is that, rather than stay over the North Sea as is their usual routine, the Bears came much further south and west.