With David Davis throwing in the towel there is speculation that Grayling, a staunch lieutenant of the Prime Minister "might" get the job.
As a loyal supporter of Heathrow there could of course be implications down the line as he holds the brief to defend the large number of objections now piling up in the courts.
There are many in the North who would love to see him move on. Having wrecked transport infrastructure in the North he would at least end up taking the rest of the country down with him.