Postcards were first issued by the Post Office in 1870 . They had no illustration,  one side was for an address and had a halfpenny stamp printed in the corner., the other side for the message.

Valentines of Dundee  were the first in Scotland to mass produce postcards. They printed images from their vast stock of photographs, which had been gathered across the nation and the globe since the company began in 1851.

Robert Smails sold the postcards in the shop, they would also produce the letterpress wraparounds as you see here in this image below. 

In 1894 the private publication of postcards  was authorised, but not until 1902 did the Post Office allow images to be printed on one side.