“I’ve absolutely loved coaching the Test side and I’m incredibly proud of what we’ve achieved together. There’ve been some unbelievable highs and a few tough days along the way, but that’s all part of taking on a challenge like this. It’s been a privilege and an honour, and I’m grateful. Grateful to the players, the staff and the fans who supported us on the journey,” McCullum said in a statement issued by the England Cricket Board.