My partners bike, a Pashley Princess Sovereign, had a flat front tyre, and whilst I was out a friend came to have a look. He removed the front wheel (detaching the brake, a fully enclosed brake hub), and afterwards had a spare part left over, an eye bolt, pictured below
Would anyone know where this is likely to come from? If it shouldn't have come from the Pashley then it is possible that it was from another bike and had been there a while.