The British defence budget will likely require choices to be made and I suspect that that one choice will be between replacing Eagle or maintaining RAF intercontinental strike capability. Following Eagle's performance in the Falkland's it'll probably be a difficult argument for the RAF to win, especially given the extensive logistics train involved in getting a single Vulcan down there.
Tornado is just about coming online as well, which if required can carry a similar payload (over a much shorter range) with higher chance of survival and a smaller crew.