A cheerful tune to start back, this is Lucky Scaup, or Lucky Scaupie, a Scottish tune that I got from a Jimmy Shand album.
I believe that Lucky Scaup refers to an old Folly in Tayport, near Dundee. It was built in the 1860s and demolished in the 1979 when it had become unstable and potentially dangerous.
The structure is AAB, as the B section is long and references the A at the end. The D/F# chords (and others in this format) mean play a D chord with an F# in the bass if possible.
Here is the recording I learned it from, our tune starts at 1:08.
New Ealing Sessions 