The Suffolk singer Don Shepherd, from whom I learned the song many moons back, recorded the Farmer's Toast with the following sleeve notes:
"Properly titled 'the Jolly Farmer', the tune to these traditional words was written by Eric Winter, from whom I learnt it."
As far as I know it was originally found in in Sussex, but variants are know all over southern England.
The version I sing is slightly different and a little longer than Don's -

THE FARMER'S TOAST

Come all jolly fellows
Who long to be mellow,
Attend unto me and sit easy.
For a pint when it's quiet,
My boys let us try it,
Dull thinking will drive a man crazy.
I have lawns, I have bowers
I have fruits, I have flowers
And the lark is my morning alarmer
So my jolly boys now
Here's Godspeed the plough
Long life and success to the farmer.

Draw near to my table
My boys when you're able,
Let me hear not one word of complaining.
For a pint when it's quiet,
My boys, let us try it,
Dull thinking will drive a man crazy.
For here I am king
I can laugh drink and sing,
And let no man approach as a stranger.
And show me the ass
Who refuses a glass,
And I'll treat him to hay in a manger.

Let the wealthy and great
Live in splendour and state
I envy them not, I declare it
For I eat my own hams
My own chickens and lambs
And I shear my own fleece and I wear it
By ploughing and sowing
By reaping and mowing
All nature provides me with plenty
With a cellar well stored
And a bountiful board
And my garden affords every dainty.

Were it not for my seeding
You'd have but poor feeding;
I reckon you'd all starve without me.
But whatever the season,
I have always good reason
To have my companions about me.