A:AnswerThis is kind of a tough question. It depends on what you're trying to do. If you are just trying to use streaming services like netflix, hulu and things like that then no you don't really need a bluray player. However if you want to watch bluray disks then you'll need to hook up your bluray player.
if you're wondering if the TV is a smart TV then yes it is and the Samsung software works very nice with netflix and all of the other streaming services. They even have their own tv channels for free.
A:AnswerI don't think they're adjustable. The distance on the 58" TV is about 40" and the 65" TV is about 44 3/4". The 60" TV should fall somewhere in between around 42".
A:AnswerI would not think that the heat generated by your Fireplace would be an issue. Your Mantle would block an extremely high percentage of any heat rising towards where the TV will be mounted. I am sure it will look great for many years.
A:Answeryes this smart tv will work in the UK, to be completely sure you will need to remove the back of the tv to see video board specs, indicating 110-240 voltage. Also you will need the power adapter to plug into your electrical outlet. I hope this helps.