The first time we went to the Warner Brothers Harry Potter Studio Tour was in 2015, just after they had added the Hogwarts Express and Kings Cross set to the tour. At the end of November 2019 we made a return visit, mainly to see how different it was dressed for Christmas and with snow.
There are lots of costumes and props in the tour and you can spend ages looking at the attention to detail and if you rush you will miss stuff.