I watched the YouTube video by John Ward about EV chargers and earthing.

I saw a 2nd video by the same person in connection with earthing of
outbuildings.

See https://youtu.be/NvENsVUhDUs

I happen to have a 3 core 10mm2 SWA run between the house integral
garage and the metal wood shed and metal framed greenhouse.

This has yet to be connected up at both ends.

I was going to go down the TT earth rod route but John Ward in his video
is saying that you can export the earth from the house to the
outbuilding provided it is 10mm2 or higher.

He also seems to imply that exporting the earth is a better and safer
option than using an Earth rod.

Would Adam Wadsworth, John Rumm et. al. like to comment?

S.