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since UK has it own independent policies and you are still Indian national, it seems that you will need those transit visa (there is nothing mentioned there about Canadian PR residents or COPR holders).
 
Hi Vensak,
But Iam not transferring from one airport to another but within the airport with layover of 1 hr
As per the above link given above :https://www.gov.uk/transit-visa/visitor-in-transit-visa and https://www.gov.uk/transit-visa/direct-airside-transit-visa
Transiting without a visa
You might be eligible for ‘transit without visa’ if:

o you arrive and depart by air

o have a confirmed onward flight that leaves on the day you arrive or before midnight on the day after you arrive

o have the right documents for your destination (eg a visa for that country)

One of the following must also apply:

o you’re travelling to (or on part of a reasonable journey to) Australia, Canada, New Zealand or the USA and have a valid visa for that country


You’ll need a visa to pass through the UK in transit (unless you’re exempt)
You should apply for a Direct Airside Transit visa if you arrive in the UK on a flight and leave again without passing through immigration control.

Exemptions
You don’t need a visa if you have one of the following:

  • a visa for Canada, New Zealand, Australia or the USA (this can be used for travel to any country)
 
I am moving to canada with copr but i want to stay in london for 20 days as my brother is there.
Can we move to canad from uk ?
 
Hi Vensak,
But Iam not transferring from one airport to another but within the airport with layover of 1 hr
As per the above link given above :https://www.gov.uk/transit-visa/visitor-in-transit-visa and https://www.gov.uk/transit-visa/direct-airside-transit-visa
Transiting without a visa
You might be eligible for ‘transit without visa’ if:

o you arrive and depart by air

o have a confirmed onward flight that leaves on the day you arrive or before midnight on the day after you arrive

o have the right documents for your destination (eg a visa for that country)

One of the following must also apply:

o you’re travelling to (or on part of a reasonable journey to) Australia, Canada, New Zealand or the USA and have a valid visa for that country


You’ll need a visa to pass through the UK in transit (unless you’re exempt)
You should apply for a Direct Airside Transit visa if you arrive in the UK on a flight and leave again without passing through immigration control.

Exemptions
You don’t need a visa if you have one of the following:

  • a visa for Canada, New Zealand, Australia or the USA (this can be used for travel to any country)
Hi I am facing the same question today. Were you able to find the answer?