Hi Curtis...how nice to have so many sets. Of course value is in the eye of the beholder, and everyone will have a different opinion. But your English pieces will usually bring more than the American pieces (unless the American set is Buffalo Pottery). I'd say of your sets the Allertons would be the most desired, then the other English makers in the order you have. A lot of people collect Johnson Bros and is has been made for many years, but because it is still rather modern and not as old, I would put it is the lesser category that say Allertons. I don't know what the "Made in England" pieces look like, so many potters made willow....so I am not sure where that might fall. Your Royal and Laughlin will be your least expensive sets...these pieces maybe going for a dollar or two each. The pieces that are unmarked, again could be early English or just an unmarked American. You might look up willow by brand at Replacements Ltd on the web...you can get an idea there...their prices are very high, but you can at least compare. Also, search on ebay to compares some values. I hope I have helped some, and remember this is just my opinion.
Jeff