This one goes back a bit in my memory. It was a song that Ed Stewart used to play a lot on Junior Choice in the seventies on Radio 1.

This purely from memory so hopefully someone will fill the gaps in or put the lines in the right order:

Happy are those children who have railways in the hall
Painting in the kitchen, stories when they're small
Friends to come and visit them, buy ribbons for their hair
To an awful lot of children these are castles in the air
To an awful lot of children these are castles in the air

(I think there's another verse in here)

Can you think how it would be if all you could recall
Was angry words and tempers or no-one there at all
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Sometimes kids are fortunate cause people can be found
To foster them and care for them and always be around
To let their friends come visiting, buy ribbons for their hair
But most of all to help them find their castles in the air
But most of all to help them find their castles in the air

Then there's a verse with a couple of lines at the end that go something like:

All these children ever ask is just a chance to share
With all these lonely children, their castles in the air

Then there's another line about birthdays, christmas, football games and other things to share da di da di da di da castles in the air.

Well that's not bad for a five minute think!

Cheers
Mark