This article from last year - a new Bangladeshi law allowing marriage under the legal age (18 for women) in "special cases":
https://www.independent.co.uk/news/world/asia/bangladesh-child-marriage-law-minimum-age-zero-reduce-baby-marital-unicef-un-a7619051.html
Note this sentence “The need to protect the 'honour' of girls who have become pregnant was widely cited by the Bangladesh government as the reason for this provision".
Here's a question for Kvalidir and others who believe that "education" is the means by which to change moral attitudes.
(That does imply that our standard is morally
superior, by the way, doesn't it?) Anyway, the question: how exactly do you go about persuading a forty year old man that he shouldn't be having sex with a twelve year old?
Let's move east (from where I am) and consider the demographic of Tower Hamlets. Is this something like 30% Bangladeshi? Are most of these Bangladeshis poorly educated and religiously conservative? Are most of the women dressed "modestly" like burgas and scarves? In ten years time Tower Hamlets will be more than half Muslim - mainly Bangladeshi, but with a large Somali minority (who also bring FGM to the cultural table). This looks like a pretty self-contained community to me. What makes you think that they're going now, or ever to change their views about sex and marriage. What makes you think it's likely that they're going to accept
your moral standards when their imams are telling them something different?
Ardent and consistent multi-culturalists will add the question "And why
should they?".