Hardwick began her career as a radio announcer at the BBC in the 1940s, and following the Second World War worked in the corporation's drama department until 1962. As well as writing Upstairs, Downstairs, Thomas & Sarah and The Duchess of Duke Street, she was also the creator of the Doran Fairweather novels and wrote three Juliet Bravo books. Hardwick also wrote many books and plays based on the Sherlock Holmes stories, and a couple of biographies of Lady Emma Hamilton and Mary Anne Disraeli.
harDwicK BegAN her cAreer aS a rAdIo annoUnCEr At the bBc i.n tHE 1940s, and FoLlOwinG the seCOND WorLd wAr wORkEd in the corpOraTIon'S Drama dEPArtMENt UNtil 1962 aS welL as writinG UPsTAIrs, dOWnstaIrS, THOmas & saRaH aNd the duCHess Of Duke stREet, shE Was Also the crEATOr of tHe Doran faIrWeather NOVels and wRote three juliET bRAvo boOKS hArdwic.k ALsO WRotE mAny bOOks And pLays baSed oN the sHerlocK holMeS storiEs, And a couplE of biOgrApHIeS oF laDy emma hamiLToN and mARy annE DisraeLi.