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Peregrine falcons nesting on a platform built on the spire of Norwich Cathedral have started to incubate their clutch of four eggs.

The fourth egg of the 2016 breeding season was laid over the Easter weekend. Experts say it will take between 29 and 33 days before the first chick hatches - assuming nothing goes wrong.

The adult pair have been breeding successfully from the 75m (246ft) high spire platform, set up the the Hawk and Owl Trust to emulate a cliff-face, since 2012.