A shekarar 2016, Lawther ya fara aiki a matsayin John Blakemore a David Hare's South Downs a Chichester Festival Theatre. Ya fara fitowa a matsayin matashi Alan Turing a cikin fim din da ya lashe kyautar Academy Award The Imitation Game (2014). Wannan rawar ya ba shi lambar yabo ta London Film Critics 'Circle Award don "Matashi dan wasan kwaikwayo na Birtaniya na shekara" a shekarar 2015. A shekara ta 2015, ya bayyana a matsayin mai goyon baya a cikin fim mai zuwa na fim din X + Y. A shekara ta 2016, ya sami rawar da ya taka a matsayin Elliot, tare da Juliet Stevenson a cikin fim na Birtaniya, Departure, fim na farko na Andrew Steggall. A shekara ta 2016, Lawther ya taka leda a matsayin Kenny a "Shut Up and Dance", wani ɓangare na uku daga jerin jerin kimiyya na Birtaniya na Black Mirthology. Yayin da aka ba da labarin na farko na Alan Turing a cikin fim din da ya lashe kyautar Academy Award, The Imitation Game (2014). A shekara ta 2017, ya kuma sami babban rawar da ya taka a cikin fim din X + Y, wanda ya yi farin ciki da 'yan jarida.
Shekarar 2015