Just been to SuperDrug in Meadowhall to see if they had any offers on this. They had a bottle on for £4.99 which I thought must be a misprice as its normally £20 - maybe an empty box!
Anyway it went through the till at this price. Apparently when they are clearing out the put them on the bottom shelf, where this was. Might be store specific, but worth a shot if your near one.
I love this scent anyway, and no it wasn't an empty box.