Hadland appeared in the comedy-drama television series Moving Wallpaper (2008–2009) as script writer Gillian McGovern, and had roles in the British comedy TV shows That Mitchell and Webb Look (2008–2010), Horrible Histories (2009, 2012–2013, 2015), The Job Lot (2013–2015) and Brotherhood (2015).
Following her training, Hadland began her theatre career at the age of 19, appearing in musicals such as Cats and Grease in London's West End.
During this period, she began to develop her talents as a voiceover artist, with credits including the white kitten in the Catsan commercial and the America surfer girl in a VO5 shampoo advert.
In addition, she appeared in the films Confetti and Magicians alongside comedians David Mitchell and Robert Webb, and BBC One's Learners.
From 2007 to 2012, she had a recurring role in the BBC Radio 4 comedy series Bleak Expectations, a parody of Charles Dickens' novels, and of Victoriana in general.