Mudlark....The Bosco Song for you

I love Bosco its rich and chocolatey
Chocolate flavoured Bosco
Is mighty good for me

Bosco gives me Iron
And sunshine vitamin D
So I love Bosco
That's the drink for me

There are some lines about Mamma in the middle, but unfortunately or not, all I can remember is a later parody

Mamma puts it in my milk to try to poison me,
But I fooled Mummy,
I put it in her tea,
Now there is no Mummy to try to poison me.