Robin wrote:
Would you have needed to export the earth if not using SWA - eg where
the cable ran inside a house, under the floor? (Purely academic question
for me in a terraced house with no off-street parking. Unless they
allow consumers to be inventive - eg a swing arm derrick across the
pavement.)

It depends on your EVSE, but the new fancypants ones don't need an earth rod
because they detect a current flowing from neutral to earth (in the case of
a broken PEN) and disconnect the supply. In that case the EVSE does need a
an earth from the supply to be able to detect that condition.

https://myenergi.com/pen-protection/

Theo