Upvote:3
TWOV is still applicable to your circumstances. However, if you enter the UK you will need to follow the rules on quarantine. Neither Canada nor Russia are currently on the list of exempt countries. https://www.gov.uk/government/publications/coronavirus-covid-19-how-to-self-isolate-when-you-travel-to-the-uk/coronavirus-covid-19-how-to-self-isolate-when-you-travel-to-the-uk