Why is Rishi Sunak going back on a manifesto pledge?

Pandemic finances are different to normal finances, as seen by today's new figures from the OBR which show that the UK's economy will not be back to pre-pandemic levels until 2022. In today's spending review, the Chancellor broke a manifesto pledge by cutting the overseas aid budget. Is this a taste of things to come? Katy Balls speaks to Kate Andrews and James Forsyth.