[6][11][13] Gavin made her professional acting debut in two episodes of the Channel 4 comedy series Shameless, as Anna Sampson.
[15][11] Her first main TV role was as Lou in the BBC drama Prisoners' Wives, which she portrayed for six episodes.
[5] Later that year, she began appearing in the BBC medical drama Casualty, in the recurring role of Faith Portman.
[16] In 2013, Gavin appeared in the second series of The Syndicate, a BBC drama, as Becky.
[18] In 2016, Gavin appeared as Alma Capstick in the ITV drama Jericho.