Here is the article rewritten in UK English, with all quotes left unchanged:
Jean Marsh, the actress who was both the co-creator and Emmy-winning star of Upstairs, Downstairs in the 1970s, has died aged 90.
The iconic performer passed away on Sunday at her home in London.
Her close friend, the filmmaker Michael Lindsay-Hogg, said she died of complications associated with dementia.

More to follow…