I think it has every right to be on the list, as per my comments above. 

The Postie might have a hard time climbing over the locked gate to the back garden and putting a letter under the back door.

In context the Postie is probably not the "Public", although those annoying people filling the letterbox with junk mail probably are! It would be quite difficult for a properly Earthed path light to have a fault that even required an RCD, perhaps someone would like to explain what fault could make a significant voltage appear on an Earthed metal item planted in the ground with reference to that same ground? Obviously this cannot happen with bigger lamp posts otherwise the street would be blocked with bodies and dead Dogs too!

In context the Postie is probably not the "Public", although those annoying people filling the letterbox with junk mail probably are! It would be quite difficult for a properly Earthed path light to have a fault that even required an RCD, perhaps someone would like to explain what fault could make a significant voltage appear on an Earthed metal item planted in the ground with reference to that same ground? Obviously this cannot happen with bigger lamp posts otherwise the street would be blocked with bodies and dead Dogs too!