Tea Cards
These would come in packs of Brooke Bond tea and then later in packs of PG Tips tea as well. My grandmother would collect them for me, the cards had at first a hand painted illustration on the front ( but then changing to photo in later years ) and some factual text on the back. You were able to send off for the booklet to stick them in and then the text was in the booklet , along with more info on the topic. These cards were an utter delight as not only were they beautiful but they also still smelt of tea for weeks later. The other utter joy was the range of subjects that was covered.
A Few Bits of Cigarette Card Books