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I'm still amazed that I went into a car park up in Scotland where the payment was "put some coins in this jar", and a jar full of coins just brimming over was just sitting there unsupervised

The honour payment system is widely used in Denmark & Germany too. Farm produce at the side of the road, unlocked drinks fridges in common areas in hotels & hostels and in harbourside kiosks, etc., etc.

We stayed in a ten room hotel in a town near Bremen which had nobody at reception when we arrived at about five in the afternoon on a Saturday. All the unused keys were on hooks on a board with a sign saying, "Please take a room key if the conceige is not present."

The manager rolled up at eight the next day to cook breakfast and check us out but there was also a letterbox fixed to the wall in reception and payment envelopes if we'd wanted to leave earlier.

Try that in the UK! Sad, really.