My V4 arrived here in the UK on the 29th December 2021 and there has not been any request for Custom Duties or VAT. A Google Search shows that the UK has signed a trade agreement with Canada which came into force on 1 April 2021, (UK-Canada Trade Continuity Agreement (TCA). It contains Preferential Tariff Rates for bilateral trade in goods between the UK and Canada. This may be the reason for the lack of Custom Duties or VAT now.