This is a national scheme used by the emergency services. 

It has been designed to encourage people to keep their personal and medical details on a standard form, along with any repeat prescription, in a tub within their fridge.

The tub initially contains a personal information form and two green cross stickers: one is attached to the outside of the fridge door and the other is attached just inside the front door above the hall light switch. 

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If an emergency arises, and the emergency services are called, the green cross above the light switch indicates the presence of the tub in the fridge.