Bottling & Cellar Management.
Beer in bulk was still being shipped out from Reading Brewery for bottling in regional centres, but even then quality control was seen as key.
This is the company ‘Bottling Manual’ from the mid-50’s.
1951 H&G Simonds Bottling Instructions Today’s publicans who serve ‘Real Ale’ may still recognise parts of this period cellar manual:

1959 A Spile in Time - Cellar Management