I first heard SF as the Simon & Garfunkel version.

More recently, I was introduced to a version in the Northumbrian Minstrelsy where it appears as "Whittingham Fair". It is virtually the same as the version sung by Ewan MacColl which was linked to by Tim Chesterton.

What I sing is essentially the version from the Northumbrian Minstrelsy but as "Scarborough Fair" - I do live in Yorkshire, after all [g]

The versions collected by Child can be found here