Hi Joey,
I wish to correct your statement that the Cavendish Hotel was destroyed during the Blitz, It was actually hit by a bomb during the blitz and badly damaged, But it was NOT destroyed and although shaken up and injured the feisty Rosa Lewis stubbornly refused to leave her beloved Cavendish Hotel.
The Cavendish Hotel was managed by Edith Jeffrey(Mary in the TV series) for a long time after Rosa Lewis died 8/11/52. The Cavendish was eventually demolished(I can not recall what year that was). But a new building now stands on the original site and there is a plaque dedicated to the memory of Rosa Lewis on the site.