Independent (UK): Softly spoken, unassuming and contemplative, Marcus Armstrong doesn’t look like an ex-convict. And the father-of-three certainly doesn’t appear the type of man to execute daring waterborne night-time nuclear base infiltrations. As for spray painting graffiti on the side of heavily armed Trident submarines — surely not? In fact, Armstrong, 49, is one of the country’s most prolific anti-nuclear protesters. A member of the pressure group Trident Ploughshares, he has spent 22 years as a …