London (CNN Business) About 100 people who worked for Prince Charles could lose their jobs now he has become King, a labor union said Wednesday. The notices were handed out while a thanksgiving service for Queen Elizabeth was being held in St Giles' Cathedral in Edinburgh, Scotland, the newspaper reported. Those at risk of losing their jobs include private secretaries and people working in finance and communications roles, it added. The Public and Commercial Services Union (PCS) called for an "immediate halt to the redundancy process," adding that some of the employees had worked there for decades. "[The] decision to announce redundancies in the Royal Household during the period of national mourning is nothing short of heartless," the PCS said.

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