NotSpaghetti
Doodledog - are you able to say why a group of "same sort" of people were brought together?
This sounds both quite weird and intriguing!
Yes, but it’s not as exciting as it sounds 
At the time I shopped with Tesco Online, and the service was quite new. The research was to find out about what people liked and disliked about the whole thing - Tesco itself, home delivery and the website. I was in one of numerous groups, each chosen from a different demographic based on our spending patterns (we all had points cards). I was paid £50 (and this was about 25 years ago, so it was decent money) to go to a hotel and chat about it all for an hour after work over tea and sandwiches. When I got there, there were six or so women of my age. We all had the equivalent of a Seasalt coat, all had similar hairstyles and shoes, and all lived in different but similar towns, based on house prices, rural/city/suburb balance, and the measures in those Acorn profiles of the time. We all had professional jobs, had two children of roughly the same age as my two, and even had similar names (both us and our children). We ate similar things, spent money on eating out as a family once a week or so, were interested in healthy food and home cooking, and more.
It was very strange, and there will have been groups of young men who lived in the city centre in riverside apartments and liked football, and old ladies who had cats and perms and drank gin being interviewed in other rooms elsewhere
.
Sorry, no international spies involved 