Danny Boyle: ‘Some days I think I’m a great filmmaker. Other days I think I’m terrible’

The visionary director of ‘Trainspotting’ and ‘Slumdog Millionaire’ has returned to horror with the sensational sequel ‘28 Years Later’. He talks to Adam White about its shocking ending, the lessons he learnt from the failure of ‘The Beach’, and what his ‘Olympics thing’ taught him about Britain