Is the Calais crisis costing the UK £250m a day in lost trade?

Freight Trade Association's estimate of cost of disruption at French port does not stack up

Is the Calais crisis really costing the UK 250m a day in lost trade?

It seems vastly improbable. The figure was issued by the Freight Transport Association (FTA), derived, using a crude calculation, from a 2014 study on the value of trade passing through the port of Dover.