He received a commendation at the 2003 Ian Charleson Awards.
Ready was born in Birmingham and grew up in the town of Harborne.
He attended King Edward VI Five Ways school in Bartley Green, after which he trained at London Academy of Music and Dramatic Art.
At the age of 17, Ready played Romeo in the National Youth Theatre production of Romeo and Juliet at London's Bloomsbury Theatre, opposite Rosamund Pike as Juliet.
He is a regular at the National and Royal Court theatres.
Recent appearances have included leading parts in Major Barbara and Saint Joan (both plays by George Bernard Shaw) and Time and the Conways by J.B. Priestley.
His West End credits include One Flew Over the Cuckoo's Nest, which starred Christian Slater.
2013
In 2013–2014, he played Lee in Utopia.
Also appearing on television, Ready received notability in 2013 for his role in the television show Utopia.
He is best known for his role as the special adviser to Keeley Hawes’ Home Secretary in the BBC series Bodyguard and Kevin in the BBC series Motherland.
2016
In 2016, he played Kevin in Motherland.
2018
In 2018, he played the role of Rob MacDonald in the BBC television series Bodyguard, and Harry Goodsir in AMC's The Terror.
His most recent theatre role was Macbeth at the Sam Wanamaker Playhouse (2018), opposite his wife Michelle Terry as Lady Macbeth.
Of his role as Macbeth the Financial Times said: "Ready is a rare bird in that he has an actorly way with oratory, but instead of keeping us at a distance from his character, it clarifies nuances and levels and paradoxically allows us in deeper."
In 2018 he featured as Harry Goodsir, one of the lead roles in The Terror, a 10-part series based on Dan Simmons' best-selling novel.
Vanity Fair said of his performance: "Ready’s character is the heart of the show: despite the various calamities that have befallen him and his comrades, he still sees hope."
Ready is married to actress and writer Michelle Terry.
They have one daughter.
2019
In 2019, Paul played journalist Nick Caplan in the BBC television series MotherFatherSon.