Wow, this map is good.
Country dispersion: 11, 7, 7, 7, 5, 5... pretty different, but I like it. You will need some non-crossing borders, as I added in my Brazil map. Because the number of border countries arent balanced, specially in Wales, see:
Continent - # countries - # of border countries - (my suggestions)
Gray - 5 - 1 (Oceania!! - bonus: 2)
Yellow - 5 - 5
(number of borders should be 3 at maximum, maybe a barrier between Powys / Gwent and Shropshire / Cheshire can help you; bonus: 3, with 3 border countries)
Brown - 7 - 3 (Africa!! - bonus: 3)
Pink - 7 - 5 (Europe!! - bonus: 5; ps: it can be attacked from 7 places, so maybe some barriers, too)
Green - 7 - 2 (very easy to hold; one more connection is good, maybe between Leinster and Gwynedd, or another, its only connect a country of Ireland to a country of another continent that is already a border country; bonus: 3, with 3 border countries)
Blue - 11 - 6 (very difficult to hold, and this is the idea, I know; I suggest you block attack routes from other continents to Lincolnshire and Shropshire; there will be 4 border countries, and bonus of 6 is fine)
Cant wait to play... the art is fine too, but I liked much more the first shield. Thats it!