It's really hot, you get plastered to the inside of the doors when it's busy and goes through Hounslow which is where the Indian population is in London. They named it that themselves and it caught on.
According to the 2021 Census, 656,272 Indian British live in London. Hounslow total population is 288,200, 21% of them Indian or around 60,000.
British Indians are the second largest ethnic group in Hounslow (after "white"), but there are almost 600,000 more living in other parts of London.
https://www.ons.gov.uk/census https://stats.hounslow.gov.uk/population/#/view-report/63aed...