LONDON — From the curry houses of Brick Lane to the tech offices of Canary Wharf, British-Bangladeshis sent a record £800 million home last year — much of it in seconds via mobile apps their parents could never have imagined.

'My father queued at a travel agent with cash in an envelope. I tap my phone and my mother gets taka in Sylhet before my tea cools,' laughed second-generation banker Sadia Ahmed, 29. Fintech firms report 60% of UK-Bangladesh transfers now go direct to mobile wallets.