It's left open, you take your chances stopping in it, be armed with a bottle of the finest malt to help with negotiations, it may be the difference of a good night sharing your bottle by the bothy stove, or being told to go forth and multiply!
There is a story of a certain Chris Bonnington attempting a stop-over in the 70's, when his appearance was met with growls (no malt in hand) he announced who he was, one of the Glaswegian knuckle draggers said "I don't care who the ****you are, **** OFF!