50ml fragrance Oil. 
Refill your reed diffuser, use  a few drops of this oil in your oil burner (add to water)  or your ultrasonic diffuser (add to water) or sprinkle over your pot pourri.
 
Norfolk: Infused with essential oils, the top notes of  Norfolk lavender with sea salt and ozone blend beautifully with a mix of herby base notes. Evocative of summer days on the Norfolk coast