My grandmother drilled this song into me along with many others as a lad and her version of the first verse is supposed to be the traditional one.

The one posted abovew read:
    As I was walkin' doon the street
    I met wi' Johnie Scobie.
    Says he tae me, "Can ye go a glass?"
    Says I, "Mon, that's my hobby." CHORUS

Grannie's version was sung thus

    As I was walkin' doon the street
    I met AULD Johnnie Scobie.
    Says he tae me, "WILL YE HAE A HAUF?"
    SaID "aye, Mon, that's mA hobby." CHORUS

Grannies corrections are in capitals

Muttley