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Moving on to trolley services, I have a gut feeling that they may actually do more business than a traditional buffet car. They will possibly engender impulse buying, which may not happen if a passenger has to get out of their seat and wander a few coaches away to the buffet, and I am also sure that there are many passengers who don't like walking around in moving trains - we all know that there is an element pf "sea legs" required, which is a skill that the occasional traveller may not have developed.
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There is another side of course. I can't be alone in when I decide I want some refreshment, I want it now, not when the trolley finally appears! I would much rather walk to the buffet and have a full range of hot and cold snacks, freshly brewed coffee etc, rather than a poor choice of crisps and nuts off a trolley with lukewarm coffee from a flask! I bet they never asked the questions like that in the survey where they got the support for trolleys!
The trolley service won't do much business if, as reported, they tend to hide in the first class kitchen, or if they can't get through a rammed 5 vice 10 coach train!