Brendon McCullum insists England's best cricket is ahead of them after Ashes 'missed opportunity'

England head coach Brendon McCullum has acknowledged the Ashes series as a 'missed opportunity' but insists the team's best cricket is still ahead of them. McCullum is urging reflection, improvement, and resilience from his squad following the Ashes debacle. England will look to bounce back when they face New Zealand in a three-Test series beginning June 4, live on Sky Sports.