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Homepage Accessibility links Skip to content Accessibility Help BBC Accountrequire(["idcta/statusbar"],function(a){new a.Statusbar({id:"idcta-statusbar",publiclyCacheable:!0})}),document.querySelector(".idcta-wrapper").classList.remove("no-js") Notifications Home News Sport Weather iPlayer Sounds Bitesize CBeebies CBBC Food Home News Sport Business Technology Health Culture Arts Travel Earth Audio Video Live More menu Search iPlayer Home News Sport Weather iPlayer Sounds Bitesize CBeebies CBBC Food Home News Sport Business Technology Health Culture Arts Travel Earth Audio Video Live Close menu !function(){var e=document.getElementById("tviplayer");-1===e.className.indexOf("tvip-js")&&(e.className+=e.className?" tvip-js":"tvip-js")}(); iPlayer NavigationiPlayer Accessibility HelpMenuChannels;;Channels Sub NavigationScroll Channels Sub Navigation leftBBC OneBBC TwoBBC ThreeBBC FourBBC Radio 1CBBCCBeebiesBBC ScotlandBBC NewsBBC ParliamentBBC AlbaS4CScroll Channels Sub Navigation rightCategoriesCategoriesCategory Sub NavigationScroll Category Sub Navigation leftDrama & SoapsFilmsComedyDocumentariesSportNewsEntertainmentMusicFoodLifestyleHistoryScience & NatureArtsFrom the ArchiveAudio DescribedSignedNorthern IrelandScotlandWalesCBeebiesCBBCScroll Category Sub Navigation rightDrama & SoapsFilmsComedyDocumentariesSportNewsEntertainmentMusicFoodLifestyleHistoryScience & NatureArtsFrom the ArchiveAccessible alternative formatsAudio DescribedSignedRegionsNorthern IrelandScotlandWalesChildren’sCBeebiesCBBCA-ZTV GuideWatchlistHomeTech Now25/04/2026JavaScript seems to be disabled. Please enable JavaScript to take full advantage of iPlayer.Tech Now - 25/04/2026Tech Now25/04/2026Alasdair Keane visits an underground insect farm turning food waste into animal feed. Shiona McCallum tours behind the scenes at Blenheim Palace where tech aids Unesco World Heritage restoration. More