[2] Born in Exeter, Devon, Lamb was educated at Dragon School[3] in Oxford, and Eton College[4] in Berkshire, where he was a music scholar.

After graduating RADA in 2010, Lamb started his professional career in opera[5][6] before joining the National Youth Theatre[7] and performed in 20 Cigarettes.

[8] In 2013, he appeared as John Willoughby in Edmundson's adaptation of Sense and Sensibility on BBC Radio 4.

[13] In 2017, he was cast as the title role in Netflix's A Christmas Prince[14] and in the upcoming Swords & Sceptres.

[16] In 2023 he was cast as the Duke of Buckingham in the Julian Fellowes drama The Gilded Age.