flour type

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hello, 

Can anyone tell me what all purpose enriched unbleached flour is? Most of this is self explainatory i know, but what is the enriched part? Im a nebie trying to learn, using the lessons here.  Have previously made some loaves, but want to learn more! I think because i am from england there may be some slight terminology differences that i probably have not heard before, so any help is gratley recieved.

Thankyou Phil.

hello,

Ok, i understand ,but does it act as a substitute for sugar, something for yeast to work with instead of sugar?

Cheers Phil.