Part 1 Your interviewers are looking for evidence of your behaviours ie how you deal with situations. The areas they are looking to test will be respect for race and diversity, teamworking,effective communication, problem solving, personal responsibility and resilience. The police interviews have moved away from asking how you would deal with a make believe situation and now ask you about examples from your own experience. The interviewers during your interview will want to ask you questions about your application ie your previous employment, gaps or information that appears to be missing or just expand on some of the information you have already written. The opening questions will an 'icebreaker' along the lines of ;why do you want to be a police officer, what research you have done and what you think a standard day will be like. These are there to get you settled and see how serious you are.
The behaviours will be tested exactly by question as contained in your question. My advice would be is to look at examples were you have challenged conflict, calmed a situation down or as the other answer suggest a diificult period in your life. Maybe a choice of course in school or changing jobs. They are not expecting you to have dealt with life or death incidents or be a Bruce Willis in a 'Die hard' movie. What they want at the end of the interview is an opinion that you demonstrate the potential to make a good police officer after training.
With all the answers you give the best way to answer them is using the following formula. 1) What the situation was. 2) What you did and how. 3) Finally what the result was.
Another question you will be probably asked is what do you understand by the term 'diversity'. So worth doing some research on the intranet, read the police and force defintions as found on police websites and get an answer ready.