Here is a Meccano Invoice from January 1959 for a Hornby Dublo Goods van, a Dinky trade pack of No 168 Singer Gazelles and a trade pack of No. 178 Plymouth Plazas.
The Singer and the Plymouth were both introduced as new items in January 1959.
A Google search reveals that C Cunningtons were a shop dealing with radio, television & electrical supplies & repairs, Meccano, hobbies and cycle accessories in the 1950s. They were located in the High Street at Wheathampstead, Herts.
A nice little piece of Meccano historical documentation.