Hello Leuchtenberg!
Re: the gal in robes you posted. Indeed the sitter was a Baroness!
It is Gladys, Dowager Baroness Swaythling. Her father in law, the first Baron Swaythling established the merchant bank Samuel Montagu and Co. The family were 'New money' with a capital N. The Samuel Motagu family produced some very interesting and contrasting personalities. Some were very high profile in Anglo Jewish affairs, whilst other were not and played down their Jewish beliefs. Their people originated from Liverpool I think.
The first Lord Swaythling was a remarkable man actually, very much the self made entrepreneur and a great philanthropist from what I recall. By the time the photograph of Gladys was taken, her eldest son had succeeded to the peerage as 3rd Baron. Her two younger sons, Ewen and Ivor Montagu lead very interesting lives. Whilst Ewen is known to have worked for MI6 and been responsible in part for the implementation of Operation Mincemeat during WWII, Ivor is suspected of having been a spy for the Soviets.