We found the above on the flyleaf of a The Homeland Guide to Dartmoor (undated but c.1947). It’s hard to imagine a plainer advertisement or, indeed, a plainer name for a flagship product. Post-war austerity and all that, we suppose.
On a related note, we also know from our recent nosing in their brewing records that, for the duration of World War II, St Austell produced nothing but “PA” (pale ale).
It must have been hard to get anything but bitter in the West Country in the 1940s.