Wearing the same green Emilia Wickstead dress coat she wore to the event last year, Kate smiled broadly as she greeted soldiers from the 1st Battalion Irish Guards at Mons Barracks in Aldershot, Hampshire.
However, at one point, Kate's foot became stuck in a drain and she had to spend a few moments freeing her heel.
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Rain will affect northern England and Wales later in the day, particularly over the hills. Elsewhere it will be drier but breezy.
The Chancellor will promise to fix a glitch, which means repayments continue to be taken for up to 12 months after the loan is paid off.
The proposal will see the introduction of a discounted railcard for 26-30-year-olds, as the government looks to lessen the cost of living.