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As that area of high pressure drifts slowly eastwards it is opening the door to a feed of south or south-easterly winds, bringing warm air from continental Europe.

A blocked weather pattern with high pressure to the east of the UK and low pressure to the west means the heat will be drawn up from continental Europe.

Congestion in the UK "is particularly severe in Felixstowe", while in continental Europe Rotterdam and Barcelona are "also pretty severe".

Instead, says Prof Williams, the US would prioritise its "territorial core", creating a continental fortress of sorts, insulated on both sides by the vastness of the Pacific and Atlantic oceans.

All football grounds have sections where the most vocal fans congregate - not just in Britain, but in continental Europe where groups known as "ultras" sit and stand together.