Fast forward 20 years and suddenly there are a number of products available, or launching soon. Sony will release the PlayStation VR, the Oculus Rift ships shortly. The technology in these varies massively: Google Cardboard is, as the name suggests, a cheap cardboard viewer you simply place your smartphone into. At the other end, units track eye movement and, in the case of the HTC Vive, lasers mounted in a room track movement.

This is starting to gain traction. Virtually Dead, recently run in London, provided an immersive experience mixing a VR headset with live actors in a zombie themed experience. Thorpe Park open its Derren Brown ghost train ride in May, also incorporating VR headsets. Market research usage might be some way off but, if consumers take to it, it could revolutionise the way it's run in the future!