Yes (ideally) from UK. Not always asked for, but more often than not, and esp for men traveling with a child it can be asked for. Just read through the gov website. When I take my niece abroad, I always have a letter with me stating her name, DOB and address, along with holiday location address, and parents info too in case of contact. Quick and easy to do one yourself, and if asked and authorities want to contact my sister, they can resolve quickly. I'd always rather have it than not. Takes 5 mins to do one yourself 👍🏽
Emirates app let's you see various dates and times. Usually weds or Thurs are about 15 hours maybe 16, stopover in DXB and soon you'll have premium economy seats! 🎉🙏🏽 Decent times too, imo