‘In the run up to the Brexit vote I remember seeing comments about bricking the tunnel up!’ says Vince, the Channel Tunnel’s British head of maintenance.

‘But I don’t think we would survive without it.’ It now carries 7,000 trucks a day and with Britain’s demand for cheap goods on the rise, that number is set to rise.

Tonight, we hear from the customs officials, engineers and truckers who strive to keep the traffic flowing. As you might expect, they have plenty to say about Brexit.