I was writing on this back in October 2012. Finally I had time to compile and work out a fair price (fair is arbritrary – willing buyer, willing seller basis is still the best). I have one special set of everything! I have error sheetlet sets for sale as well.
Check it out at eBay (search for Royal Visit) after my links expire or just drop me a note if you cannot find it (maybe I stopped listing it).
Ultimate set: Click here.
Only the error sheetlets in excellent mint condition: Click here.