The Cyber Incursion (The NK Tales)

Plot
Something is making Cybermen appear in Nottingham City but they aren't attacking, In fact they want to help the humans, from 'The Incursion' but what is The Incursion?

Trivia
This is the first time the Cybermen are part of the Protagonist cast in The NK Tales, but due to being enemies (although not the main enemy) they are still in the villain section