Thanks for the feedback - yes, depth of field is lacking and the end of the sign is sadly not in proper focus. In hindsight I would certainly try to expose for better depth of field; I was mostly shooting birds where fast shutter speed is imperative!
You may be interested to know that the tree at the right is on a traffic island and there is a lane of roadway either side of it - one between the sign and the tree, another between the tree and the rising land behind it.