If you never plan to go to Canada to live, work or study in the future then just tick no when you look to complete the eta for Canada, the Canada authority’s do not have access to the UK PNC so will no be able to see this information.
if in the future you plan to live, work or study over there, then do not lie on the eta as this will be picked up in the future when you apply for either a work/ study visa etc when you have to supply a police certificate during the application process
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