You'll first need to determine your residency status to see if you need to report your UK income on your tax return. If you are still considered a "resident" of Canada then you are required to report your World Income when you complete your Canadian Tax Return.
This link to the CRA information will help you determine that status: https://www.canada.ca/en/revenue-agency/services/tax/international-non-residents/individuals-leaving...
If you are required to report this income, you should use the 2018 UK Average of 1.7299 to convert the amount to Canadian dollars.
The Bank of Canada also has a currency converter which you can find here: https://www.bankofcanada.ca/rates/exchange/currency-converter/
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