Had a quick look at this site today and in all honesty, apart from the vault it's all very boring These crazy bankers obviously lived an exciting life.
The vault is well worth seeing though if you are passing but do take some good lighting as it's truly pitch black down there.
Thanks to the Meanwood Monks for the info, top fellas as usual
Outside and the different floors, about as bland as you can get
The downstairs Vault
The stairs and the upper level