How did the Trident test fail and what did Theresa May know?

Shashank Joshi, a senior research fellow at the Royal United Services Institute in London, said: “I think it’s crucial to tell people that the Trident missile is identical for both the US and UK, as they are drawn from a common pool, and that test data is undoubtedly shared between the two countries. So who is doing the test is far less important than how often overall. And there, we have over 150 tests over almost 30 years, with a sub-3% failure rate, and well under 1% since British submarines began carrying the missiles.”