Police are "confident" remains found in Dorset are that of the 19-year-old, who has been missing for 11 days.
The chancellor says investment will "prepare the ground" for the cars to be on UK roads by 2021.
The Queen and Prince Philip plan to spend the day with family and friends, Buckingham Palace says.
Wednesday's Budget will include cash for driverless cars, the NHS and housing, Sunday's papers say.
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