I believe I heard early on in the rise of Rolling Home (like about 10+ years ago) that the 'Frost is on the hedgerow' verse was added later and written by John Tams at Roy Bailey's request, as in, please make the song longer.

These days most folks I know here on the left coast sing the last verse
So pass the bottle round
And let the toasts go free
It's a health to every laborer
Where he or she may be
Fair wages now and ever
Let's reap what we have sown
When we go rolling home (2X)

Blessings
Barbara