Time for an oil change! From avocado to grape seed oil, there’s never been more choice in the supermarket. So what’s tastiest and healthiest?

Forget expensive coffee or wine snobbery — nowadays it’s your choice of cooking oil that announces your social status. Last week it was reported that sales of rapeseed oil are soaring, with many consumers opting for this home-grown product as an alternative to olive oil. But others advocate coconut oil and then there’s sunflower, avocado…