Hi - if anyone is intermediate level and thinking of moving back to Bengali speaking areas you are welcome to join our closed Let's Learn Bengali Intermediate Facebook group. You will be sent a questionnaire or a test to complete first. We also have a casual open group and a closed beginners group for focused study. If any Bangla speakers want to help out you are welcome in the open group too!
There may also be an online course starting at a UK university next academic year. If you are into Bengali please write on a comment!