My own town is smaller than those mentioned, but there definitely is a lack of integration between the indigenous people and the Bangladesh community. They have been here for 50 years, and if anything the problem is worse now than then. They worked in the cotton mills, and they were ‘forced’ to communicate and join in. Since the factories closed, the second and third generations (who all speak good English) tend to work in their own small businesses and meet the public professionally, but not socially. Even sports, they have cricket and football teams and play in leagues, but they are all Bangla teams.
There isn’t much crossover, but I do not see how money will solve that problem.