Good post.
I understand why you are comparing us with Canada and Australia, and whilst this isn't as much of an issue in this day and age, the location of those two countries compared to other important nations should also be considered. The UK has many more important neighbours on their doorstep. Ok one of them will be the EU which may or may not be fruitful but the options are always there. Those two countries may have 10, 15 or whatever but who is to say we can't get more. Its clearly not impossible and our experience of being in the EU should help us in that regard, not to mention our historical colonial ties to many countries world wide.
Your very true about the Tory old boys club however at least they are old boys I can vote in or out (at least most of them). We desperately need a credible opposition to make a true success of Brexit. There is definitely a large element or the Brexiteer movement that want the UK out at any cost to stop all these 'jolly foreigners' but there are also lots of Brexiteers that look forward to the type of nation we can be away from the conformaties of the EU. I don't think it is right for such different cultures to be brought together in the way they are. British culture is far different to any other culture in Europe, we are a bunch of twats to be honest and you are probably better off without us!
Don't get me wrong either, I am a big fan of the original concept of the EU. Easier trade, easier movement of people, shared intelligence and ideas. They are all brilliant concepts. The problems come with shared currency, shared laws and an overpowering "justice" system, and the growing potential of a unified army are all becoming too much. Each individual county should be celebrated for its independence, for what that country means to its people and how that country governs itself. It shouldn't be shoehorned into a one size fits all, where the bigger countries, one way or another will always hold more sway than the smallest leaving the rest to conform. It's an exaggeration but when you look at where what has happened since its introduction, who knows what will haplen in 50 or 100 years from now.