What is the process for obtaining an exit visa and emergency travel document in Thailand after losing a passport?

The user, a UK citizen, has lost their passport and is seeking an emergency travel document to travel to Cambodia and return to Bangkok. They inquire about the 'exit visa' they need to obtain from Thai immigration but find little information available. Various community members provide advice on the process, highlighting the need for a police report, documentation of their travel arrangements, and clarification about the nature of an emergency travel document, which may not allow for normal travel use. Additional information on immigration wait times and visa stamps can also be found in the discussion.