And dedicated seating areas in the buffet car for passengers consuming food and drink bought from the buffet - I think the Class 442 "Wessex Electric" EMUs were the last trains to run on the National Rail network that had that, at least in the BR and South West Trains eras before 2007 when they were withdrawn and refurbished for Southern/Gatwick Express.
In the days when buffet cars used proper cups and plates, rather than disposable packaging, taking your refreshments back to your ordinary seat wasn't really an option - it was expected that you would consume them in the buffet car. That began to change with the introduction of Maxpax tea and coffee in I think the 1970s, but even then passengers would often still consume their refreshment in the buffet and then return to their seats (or sometimes they would stay in the buffet for the whole journey).
And even on Mark 3 buffets without dedicated seating areas, in BR days you would often see passengers standing by the buffet counter drinking tea and coffee out of disposable cups or beer out of cans (either straight from the can or from a disposable plastic cup). Meeting for a drink in the buffet was regarded as a social occasion for many commuters and business travellers especially. Even on the few trains that still have a proper buffet rather than just a trolley you don't seem to see many passengers doing this these days, though. I suppose it died out with the Covid pandemic and no-one has got back into that habit.
The two exceptions to this are Sleeper trains, which still have a lounge car where passengers will often consume their refreshments on the spot, and the Eurostar bar car where it is also still quite common (albeit standing rather than sitting).
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