London-based Bengali translator/interpreter for NGO documentary

Looking for a London-based Bengali to English translator/interpreter who can help me with various interviews and other material from some recent filming in Bangladesh on behalf of a NGO which provides health services to the disabled

I need the person to help me to make sense of some filmed sequences and then to provide accurate, idiomatic translations of the chosen interviews

in total perhaps 2-3 days work but probably not all in one go. I am based in London (Balham/Clapham area) and will need to meet up with the freelancer to work through the material.

Flexibility and good humour essential