Not sure I get that one.
Checks Nautical Miles to Kilometers. 1.85km. OK Morocco to England is...
http://ports.com/sea-route/port-of-tanger,morocco/port-of-london,united-kingdom/
1536km so with a bit of a bend that might hit 4000km.
But...
https://en.wikipedia.org/wiki/Morocco#/media/File:Morocco_(orthographic_projection,_WS_claimed).svg
Given the Isthmus would it not be easier to route things over the Spanish and French Grid into the UK and share the electricity/costs of the project or is that another Brexit benefit?
"They include the French energy giant TotalEnergies..." etc