I have a US visa, a Canadian transit visa and an Indian passport. Do I need a DATV to fly through Heathrow? [duplicate]

I am flying from Seattle to Mumbai with stops at Vancouver and Heathrow.

I am aware of the new regulations effective from the December 1, 2014 (News Article) . According to this news article, I am trying to understand if I am exempt based on this rule - "you are travelling from (or on part of a reasonable journey from) Australia, Canada, New Zealand or the USA and it is less than 6 months since you last entered that country with a valid entry visa."

I entered the US three years ago so that's out of the way. Although, I will be entering Canada on my way to Heathrow. I change flights at Vancouver but I do not leave the airport. And this happens hours before I enter Heathrow. Does that count under the rule stated above?

Update1 : I found this and called Heathrow airport Terminal 1. A lady answered and I asked her this question. She said I should be good as long as I have a valid US visa. I'm not sure if I can take her word for that though. Also, she said that I would still be airside even if I had to change terminals. I will only have to go landside if I had to pick up my checked in luggage.

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Is transit visa required for London for Indian passport holders?

Indian nationals, unless they come under one of the exemptions listed on the UK government web site, need a Direct Airside Transit Visa if they transit airside or a Visitor in Transit Visa if they transit landside - so either way a visa would be required.

Do I need a transit visa when going to Canada via the USA I have a student visa for Canada?

You need an eTA to transit through Canada by air if you're from an eTA-required country. You don't need an eTA if you're transiting through Canada and you enter by train, bus, boat or cruise ship. You do need to bring the right travel documents.

Do I need transit visa for connecting flights London?

You might need a Visitor in Transit visa if you're: changing flights in the UK on your way to another country. going through UK border control, for example to check in your luggage for a connecting flight. leaving the UK within 48 hours.

Is transit visa required at Heathrow airport?

If you are passing through a UK airport while on the way to another country, you may need a UK transit visa. Transit visas are required by some nationals who are passing through the UK en-route to another country within 24 or 48 hours.

UK Transit Visitor Visa 2022 and UK Airside Transit Visa 2022 Requirements and Eligibility

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Nataliya Vaitkevich, Porapak Apichodilok, Ketut Subiyanto, Charlotte May