Even if the Cornish nation and its Duchy constitution are once more ignored, the above Youtube presentation -found here- is still of good educational value. How common is it for English people to continually confuse England, Great Britain and the UK? Do UK citizens have any idea of their relationship to places like the Isle of Man or Bermuda? The above will help.
Something like the above, or the venn diagram found on the blog, but which show ALL territories based on actual constitutional law would be much more interesting. This would be a far more useful democratic tool than yet another presentation of the establishments rubber stamped vision of things.
It's not surprising the Duchy is ignored though considering the lengths to which the UK establishment has gone in order to sweep it -and consequently our national identity- under the carpet.
For further reading for all those interested in actual constitution: “A Mysterious, Arcane and Unique Corner of our Constitution”: The Laws Relating to the Duchy of Cornwall.