This is one of the many "Alike" Series which were issued by several related and unrelated businesses in the 1960s, listed under the "D" section of our original Trade Index set and the "HX" section of our more modern volumes.
Intriguingly, this was the only set of cards ever issued by Preston Dairies, and we are not quite sure when it was distributed. Murray Catalogue of Values says 1966, but in Vol.1 No..5 - for September October 1965 - of our Cartophilic Notes and News magazine it says this set is "an alike series similar to the set issued by Armitage Bros Ltd", so ours must have been issued after that.
By the way, the set was reported as a new issue by Mr. W Smart, who I knew very well as Bill Smart, one of the most prolific collectors of tea related material.
Now the full details of the Armitage Bros Ltd set are recorded in our newsletter for the 18th of February, 2023, but it is the first card up, so it is easy to visit. And that is the home page for what is becoming a tale of many twists and turnings......