Active job

Want to see if 2 walls & fireplace are structural

I'm looking to remove a couple of walls and a fireplace in my 1920s bungalow to create an open plan kitchen/living space. Wanting to see if these walls are structural before doing so. The 2 walls seem to have been added to create a bedroom in the 2000s as part of a consented extension (see photo attached - yellow highlight shows walls I am wanting to remove, blue outline shows position of fireplace)