"A Delicious Lunch. Sainsbury's Breakfast Sausage" advertisement proof[?]

Illustrated advertisment of a lady having a picnic lunch, cutting bread, a plate of butter and sausage on the table in front of her. This is possibly a proof of a newspaper advertisement.

'A Delicious Lunch. Sainsbury's Breakfast Sausage. A delicious smoked pork sausage, made from finest dairy-fed pork in accordance with the famous City recipe which has earned the appreciation of thousands of London business men. Economical in use, one pound goes almost as far as two pounds of a joint- and there's no bone, no gristle, and no waste. Saves fuel too, as there is no time spent in cooking. Ideal for Sandwiches or light lunch, or as a relish for breakfast. Quality guaranteed by Sainsbury's. Any weight supplied, 1/8 per lb. Sainsbury's Head Depot: Stamford House, Blackfriars, S.E.1'.