Nonetheless, at the moment CANZUK is still only a security blanket. It's something that provides warm and fluffy thoughts, but actually provides nothing to make any of the four countries better off.
Note how there's already an organisation all four countries are part of - CPTPP. It would be possible to push for CPTPP to do more, as currently expansion is very slow. But unless I've missed something Canada still hasn't ratified the UK's membership. Nor has it agreed to an expanded free trade agreement beyond the continuity EU deal.
I think that's a useful barometer of how serious Canada is about something like CANZUK. You can't have meaningful cooperation if Canada doesn't want free trade with the UK. Presumably it's some minority lobbying group that the Canadian government doesn't dare defy that's holding this up - farmers? It's not like the UK has some sort of major diplomatic or economic beef with it.
Dairy farmers in particular. Canada has had a managed supply system for dairy and poultry farmers since 1947. It has been instrumental in protecting our farmers from unfair competition from the South, which is highly subsidized I might add. Without it, most dairy farms in Canada could not survive. I'm not a fan of supply management in general, but in this case, there are strategic implications that are unique to Canada that require some sort of support for farmers. By setting quotas on milk, eggs, and poultry, a minimum price is established that maximizes profit for these goods, while ensuring there is minimal oversupply. Given the US heavily subsidizes it's farmers, it rankles that they find fault with our system. Make no bones - if supply management is dismantled, it will mean government subsidization in order to protect our food supply. The UK subsidizes its farms as well, and I believe most if not all European countries do the same. I will add that under the current free trade agreement with the US, who moan and bitch about this with dramatic statements such as "Canada charges us a 250% tariff on eggs and milk", there is a sliding scale of allowed imports of daily and eggs into Canada such that tariffs only start to come into effect after a certain volume of those goods are allowed in. In other words, there are ZERO tariffs on milk and eggs until a point where the importation starts to become a threat to our food supply. In the time that this has been in place, that level has NEVER been reached. US dairy and eggs have never been subject to tariffs under this free trade agreement. I will point out that New Zealand and Australia have also complained about our system during TPP negotiations. Ironically, farm unions in the US ((the Wisconsin Farmers Union (WFU) and Dairy Farmers of America (DFA)) are looking at Canada's supply management system to resolve their own problems of low prices. It's a complex issue, but very much misunderstood.
I see no benefit to Canada in a CANZUK affiliation that we can't already get from an existing trade or security relationship. It would be another useless bureaucracy in a time where we should be looking to make more efficient use of the relationships we already have in place.