Book about the King of the Cats

[Messalina]

When I was a little girl I had a book about a girl & boy who who helped a cat who was king of cats. I seem to remember that by drinking the liquid in the green & blue bottles in chemists' windows, they could talk to the cats. Can anyone tell me what the book was - it's driving me nuts.

[mccfluff]

is it this?

http://books.google.c...num=4&ved=0CCYQ6AEwAw

[Messalina]

Thats the fella - thankyou so much. Must order it & relive my childhood.