Classic. It'd also go very well to the tune of "My Old Man's a Dustman" as sung and assembled by Lonnie Donegan .

But I just checked , and the DT doesn't seem to have that one (it probably does, in some variant but a search for "dustman" didn't throw it up) - I found the words on this useful site of children's songs

And here they are:

Now here's a little story
To tell it is a must
About an unsung hero
That moves away the dust
Some people make a fortune
Others earn a mint
My old man don't earn much
In fact he's flipping skint

Chorus:
Oh, my old man's a dustman
He wears a dustman's hat
He wears gorblimey trousers
And he lives in a council flat

He looks a proper 'nana
In his great big hobnail boots
He's got such a job to pull them up
That he calls them daisy roots

Some folks give tips at Christmas
And some of them forget
So when he picks their bins up
He spills some on the step
Now one old man got nasty
And to the council wrote
Next time my old man went round there
He punched him up the throat

Chorus
I say, I say, Les.
Les: Yeah?
I found a police dog in my dustbin.
Les: Well how do you know it's a police dog?
He had a policeman with him.

Though my old man's a dustman
He's got a heart of gold
He got married recently
Though he's eighty-six years old
We said "Here, hang on Dad,
You're getting past your prime."
He said "Well, when you get my age
It helps to pass the time."

Chorus
I say, I say, I say.
Les: Huh?
My dustbin's full of lilies.
Les: Well throw them away then!
I can't, Lilly's wearing them.

One day whilst in a hurry
He missed a lady's bin
He hadn't gone but a few yards
When she chased after him
"What game do you think you're playing?"
She cried right from the heart
"You've missed me, am I too late?"
"No, jump up on the cart!"

Chorus
I say, I say, I say.
Les: Not you again! My dustbin's absolutely full with toadstools.
Les: How do you know it's full?
Because there's not mushroom inside.

He found a tiger's head one day
Nailed to a piece of wood
The tiger looked quite miserable
But I suppose he should
Just then from out a window
A voice began to wail
It said "Oi! Where's me tiger's head?"
"Four foot from his tail!"

Chorus
Next time you see a dustman
Looking all pale and sad
Don't kick him in the dustbin
It might be my old dad.