Private enterprise allowed
From 1 September 1894, the Post Office allowed postcards published by private businesses to be posted. A halfpenny adhesive stamp was to be added to these cards before posting.
Several manufacturers produced cards. The first publisher to include pictures on the cards was believed to have been George Stewart of 92 George Street, Edinburgh. Later research published in Picture Postcard Monthly in 1991, has shown that the first British picture card was published by ETW Dennis of Scarborough. Two postmarked examples of the September 1894 E T W Dennis card have survived.
These early cards had the address on one side, and the message and the picture were on the other side.
This meant that the picture was very limited in size, although a view could be slightly larger than a CDV. Between 1895 and 1899 Court Cards were issued - these were smaller than the old size postcards we're used to, being 4.75 inches by 3.5 inches and these had a small picture on one side, the address to be written on the other.
Size matters!
Production of picture postcards increased dramatically after November 1st 1899, when the British Postal Authority allowed an increase in size to 5 ½ inches x 3 ½ inches. Messrs Raphael Tuck & Sons were the first to print picture postcards in the new size.