As a child, I had a book that was A5 size, hardback and navy blue colour, with a gold embossed whirligig/windmill on the front. I am pretty sure it was called 'The Windy Day'. It had a character in it called Aunt Jean, who rode a moped.
I have searched and searched in vain and am starting to think I've imagined it all these years. Anyone have any memory of it?