How has Chris Grayling left the UK's ports so poorly prepared for no-deal Brexit?

Department for Transport under fresh scrutiny over botched plans to avert chaos at the border after 29 March

Chris Grayling’s at times shambolic handling of the risks posed by Brexit to Britain’s crucial transport infrastructure faced renewed scrutiny on Wednesday as MPs grilled the prime minister about a no-deal ferry contract signed and then cancelled by the Department for Transport (DfT).

The most senior member of Grayling's department also answered tough questions from the Public Accounts Committee about rushed procurement, wasted money and a worrying lack of preparedness for a no-deal Brexit at UK borders.

With just six weeks to go, how did we end up at this point?