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At Mount Stewart - National Trust in County Down, the Dodo Terrace is a menagerie of strange stone creatures crafted in concrete by Thomas Beattie. They represent the Ark Club, a society gathering that met here during the First World War. One of the sculptures, a dodo, has been knocked off its plinth in a storm. Stone conservator Douglas's mission: to save the concrete bird from extinction. Watch more from Mount Stewart in the final episode of Hidden Treasures of the National Trust, Friday at 9p

Winston Churchill escaped the pressures of World War Two by building a wall in the garden of his home at Chartwell. Now National Trust conservators reinforce his D-Day memento so it can stand the test of time. 🧱 📺 Hidden Treasures of the National Trust | BBC Two and BBC iPlayer - new episode 9pm Friday. | BBC Arts