As to the benefits of Brexit, I have posted comments about the advantages of buying foodstuffs without the tariffs imposed by the EU

I can't speak for anyone else, but I have not explored that here because it requires quite elaborate and disputed economics. The ERG's favourite economist, Professor Minton, advocates getting rid of tariffs entirely, and is quite content that theis would lead to the demise of UK farming etc. Which, since it limits our options, is actually quite bad in terms of sovereignty as we would be limited to picking between whatever deals others would be prepared to offer. Almost everyone else thinks letting our local farming collapse is a really bad idea. Some people argue that lowering tariffs leaves more money in people's pockets, which is a good thing. But if they can only spend it on foreign goods that is a net flow of resources out of the country, which is not a good thing at all.

I may be the only person in world who thinks this, but it seems credible to me that if we want to reduce climate change we need to encourage people to buy locally and that tariffs on imports will eventually be one of the tools we use to help manage this.

So: I regard reduction of tariffs not as a 'good' but as 'uncertain benefit'.