How can I find out if a wall is a supporting one l

I am about to purchase a period flat it does though have a wall located in the middle of the living room that if removed would improve the space ten fold. When knocked it is definitely not a stud wall and appears to be made from bricks. What I currently see is a square room (the living room) with a box shape room now the bathroom place to the right and taking up a quarter of the space. It is not an old chimney but I can say that the flat is located in the basement and I think is Georgian.