Was Grayling right to approve a major port terminal on 'unique brownfield habitat'?

At the end of last month, transport secretary Chris Grayling announced that he had given the green light to plans for a new port terminal on the site of the former Tilbury Power Station in Essex on the north bank of the Thames. The project, known as Tilbury2, will see the existing port, owned by Forth Ports Group, grow significantly.