So they roughly put it out between 12:45am to 2:15am. Once our BA flight was delayed till 8am and when we went to the lounge at 7am, they still had the hot food out which was a good surprise. On that flight they served us with the breakfast as soon as we took off then the light meal before landing. It was strange that some people were complaining that they did not want breakfast at 9am but rather after 6 hours!