Thanks to the regular videos that Wendy Barrter puts on You Tube we know that the adult pair are returning to the nest platform (aka 'scrape') from time to time.
They will continue to do this throughout the winter to ensure no intruding peregrines think the nest is unoccupied.
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Here's one of Wendy's recent videos but there are more if you scroll down to the comments to the previous blog post. This one shows the female preening on the platform.
This project is managed by Derbyshire Wildlife Trust, with The Cathedral, Cathedral Quarter and Derby City Council (especially its IT team) as partners.