BRENDON MCCULLUM left his role as England’s Test head coach today but will remain in charge of the white-ball set-up. McCullum has paid the price for a poor run of red-ball form with a 4-1 defeat in last winter’s Ashes followed by a 2-1 home loss to New Zealand last month, which occurred amid the backdrop of another off-the-field incident under the watch of the Kiwi coach. Ben Stokes announced his international retirement midway through defeat at Trent Bridge and that will prove the final Test…