Only in Orkney

The cafe at the airport ( they do really nice cakes and home-made stuff) is closed for renovation .

but they have got a self-service setup just next door

So you help yourself

And there is tea and coffee

And help yourself to milk from the fridge

And there is a price list 

And a box for the money.
I tihnk there is about £40 in there.

Lock the money away ?

Why would you need to do that ?