I seem to be posting an awful lot about Whitbread. Tell me when you start to get bored.
Today it's a table of their bottled beers. You'll notice that many are the same as those brewed in 1933. A couple of words of explanation. What's listed as PA is in fact their IPA. EMS I'm pretty sure stands for "Export Mackeson Stout". Noteworthy is the presence of two very dfferent Brown Ales: Forest Brown and the much stronger and more highly-attenuated Double Brown.
You can see how popular Mackeson Stout was in the 1950's by the fact that there are analyses from four different Whitbread breweries: Hythe (the original Mackeson brewery), Chiswell Street (Whitbread's original home in London), Kirkstall (Leeds) and Stockport. All have been closed for a couple of decades at, least.