Rich Deceiver by Gillian White is not a recent book. It was first published in 1992. I loved this book and thought you might like it too.
It is based on a fascinating premise. Ellie Freeman wins over a million and a half pounds. She decides not to tell anyone but instead to organise things so that her husband will become successful and win back his self-respect.
The results are unexpected, funny and sometimes a bit sad.
The author is English and has written many other novels including historical romances as Georgina Fleming.