Need Breed Clarification

[IAChick]

I purchased a quad of LF Speckled Sussex and am wanting to learn more about other "smaller" Breeds with similar color patterns. First is there a "bantam speckled Sussex"? I understand the "millie fluer" is a color pattern not a breed and a "Milllie De Fluer" is actually a color of the Belgian D' Uccle? And that the Old English have this color pattern as well with smooth legs? If there is a "bantam" Speckled Sussex what is the difference in it and the Old English?