Guest;Grandad, Burscough:
The lines you quote seem to be a little out of season. Apart from the use of 'Shilling' with a sudden drop to halfpenny, it looks like the Christmas begging song:

"Christmas is coming,The goose is getting fat.
Please to put a penny in the old man's hat.
If you haven't got a penny a ha'penny will do,
If you haven't got a ha'penny a farthing will do,
If you haven't got a farthing, God Bless You!"

Though I've heard my children come back from school having learnt this without the fourth line. Possibly their teachers can't remember farthings!

Nigel