Adrian Mitchell's poem, inspired by a radio announcer's mispronunciation of Larkin's first line, is on this link.
Here it is:
They tuck you up, your Mum and Dad
They read you Peter Rabbit, too.
They give you all the treats they had
And add some extra, just for you.
They were tucked up they were small,
(Pink perfume, blue tobacco-smoke),
By those whose kiss healed any fall,
Whose laughter doubled any joke.
Man hands on happiness to man.
It deepens like a coastal shelf.
So love your parents all you can
And have some cheerful kids yourself.