Going from USA to India via London with expired US visa but valid Canadian visa

[fedup_traveler]

I am an Indian national going from US to India for H1B stamping via London Heathrow using British Airways. My F1 visa stamp has expired and I understand that this would mean that I require a DATV. But I have a valid unexpired Canadian visitor's visa. The BA people are trying to tell me that it only works if I was traveling from Canada to Heathrow. Is this true? I thought if one had a visa for US, Canada, Australia or NZ, it did not matter where one was traveling from? The exemption clause says about airside transit: a valid visa for entry to Australia, Canada, New Zealand or the USA (whether or not the holder is travelling to or from these countries). So which is true?

[pontevecchio]

They are wrong. Did you run the checklist on the British Consulate Website? Run the scenario by them by email and they will guide you and you can carry the response.