There are some songs you just don't mess about with, and this is one of them.
You can still put your own stamp on them, your own emotion but keep the melody (e.g. Leona's Summertime, or Matt Cardle's First Time Ever I Saw Your Face)
I think messing up the melody allows him to hide from the demands of the song. He sang with no feeling whatsoever (which makes the upset about Grandad dying three years ago even more irritating) and tacked on some vocal gymnastics which are completely wrong for the song.
Plus he's ugly, looks about 20 years older than he is and has been styled as a Poundland Sam Smith.
Awful.