Etymology of butty (Was Re: Full English Breakfast with **Brown Sauce**)

[Goddlefrood]

> Carol:
> "bacon butty"

> Any ideas regarding the etymology?

Goddlefrood:

I was tempted to look it up. It's said to be a contraction of 
buttered sandwich, which makes sense. See:

http://www.allwords.com/word-butty.html