"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: "
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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)
a residence permit issued by Australia or New Zealand
you have a common format residence permit issued by an European Economic Area (EEA) country or Switzerland