If life is a video game, Muse are winning. A festival-headlining British rock behemoth, they've just released an album, 'simulation theory' – their eighth – that cements their reputation as the black mirror beatles. but while vr headsets, visions of the singularity and concerns about autocratic government are worthy distractions, it's the friendship between the three members that holds the band together, finds Tom Connick.