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http://en.wikipedia.org/wiki/Conveyor_belt_sushi
This is a fun and interesting way to try out a bunch of different sushi. There's a pretty good one in Japantown in San Francisco. I'm not sure about other major cities.
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That looks like it could be fun, though I don't know whether they have one here (York, UK). Maybe instead some type of sushi buffet would work, though I always worry that the quality of the food isn't very good in a lot in buffet type places.