Believing that the original 1954 version of Guy Hamilton was on TV I actually watched the 2015 BBC version of Aisling Walsh. Aisling Walsh is an Irish director who has done much work for TV (in 2012 she also made a "Room at the top" remake for the BBC), but with "Maudie" (2016) she also made a feature film for theatrical release.
I can't compare (as yet) with the original version, but the 2015 version is very well, with good period atmosphere.
"An inspector calls" is based on the play of the same name by J.B. Priestley (1945). Earlier Priestleys novel "Benighted" (1927) had been adapted by James Whale into the movie "The old dark house" (1932). Both novel and play are comments on the English class society.
The story of "An inspector calls" is about the suicide of a working class girl. During an interrogation by the mysterious inspector Goole (being a group interrogation, this gives the play / film a very Agatha Christie like flavor) it turns out that all of the members of a wealthy family have contributed in one way or another to this suicide.
The story has aged very well. I would like to call attention to a couple of things in particular.
In the beginning of the film the father of the wealthy famlily says "It is not important where you start in life, it is important where you finish". The old American dream phrased differently. His own family is the living proof of the fact that it does matter where you start in life.
Inspector Goole is very mysterious. He seems to be omniscient, interrogating to force a confession and not to learn more himself. He makes a very moralistic farewell speech, in which he says there are thousands of people like the poor working class girl in the story. It is obvious that he is not an ordinary police inspector. It is for the spectator to decide who or what he really is.
The members of the family ar all guilty of the suicide of the girl. There guilt is however ethical and not legal. It is disenchanting to see how quickly some members of the family recuperate when they become aware of this distinction.
