Document that required for use in Bangladesh need to be notarised by Notary Public and then legalised by the UK Foreign and Commonwealth Office (Apostille).
After the Apostille, the document then needs to be stamped at the Bangladesh High Commission.
Guidance on the how and where to submit documents to them can be found at: https://bhclondon.org.uk/other-consular-services
Give us a call or email your documents in. We can then confirm fees and requirements.