Lisa Martin, a former care home worker who alerted police to failing at the Orchid View care home in Copthorne, said she the "final straw" for her came when she was told by a nurse that 28 drug errors had been made on just one night shift.
She called police who arrived the next day.
The coroner said 19 residents at Orchid View suffered "sub-optimal" care. All of those residents died from natural causes, she ruled. But five of those died from natural causes "which had been attributed to by neglect", Ms Schofield ruled.
They were Wilfred Gardner, 85, Margaret Tucker, 77, Enid Trodden, 86, John Holmes, 85, and Jean Halfpenny, 77.
More top news
Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.
A wet, wintry night in places with rain and hill snow slow to move away from southern Scotland and northern England.