Minute silence for Tunisia victims
They were among 30 Britons killed when a gunman opened fire on a beach in Sousse last Friday.
Mr Stollery a 58-year-old social worker for Nottinghamshire County Council was on holiday with his family, while 24-year-old Carly, a photographer, was with her fiancé and friends.
The silence will take place at midday.
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Hide AdFlags will be flown at half-mast over Whitehall and Buckingham Palace, while play at Wimbledon will be delayed.
The Queen and Prime Minister David Cameron will join the silence.
The first inquests into the deaths of the Britons will begin later, with the bodies of more of the dead expected to arrive back at RAF Brize Norton.