One of my little jobs online is to help look after the pre-Worboys (ie before 1964) UK sign pool, and part involves deciding which signs are actually eligible or not. Not remembering more than half myself, as although they were discontinued then many remained well into the 80s before they started becoming rare. This is a perfect example I stumbled across today, and bear in mind despite its almost perfect condition it's at least 46 years old.
I look at a number of preliminary criteria which instantly disqualify it if wrong, the font and design. This one reaches stage two, it's either made nationally so passes, or privately or by the local council in which case it still fails as they made signs in the style of the time but not the format. This sign is on a public road, but as it points to a private garage tells me the owner applied to the council for a sign as people kept parking in front of it and they allowed it to be made. It's still a beauty but would be nice if it scored another official point as well.