When "Wuthering Heights" was released 40 years ago this year, it became the first song written and performed by a woman to reach number one in the UK charts. What was the song's — and Bush's — special appeal? Why have there been more parodies than straight covers? And why is it so popular now, with re-enactments of the music video taking place around the world? FT music writers Jude Rogers, Helen Brown and David Cheal discuss the song and its afterlife.