Tina Allen is the mother of Scout and Liam. She turns up out of the blue in Series 8.
In Series 7 Episode 8, Scout is caught with drugs, Scout tells Mr Mead that Tina had MS and needed the drugs to survive. However, Scout was lying and Tina revealed to Mr Mead that Scout needs to sell the drugs to earn a living for the family.
Tina was also involved in the marriage of Scout and Danilo Babicz where Danilo's brother, Yevhen, was prepared to pay for the service of Scout in order for the pair to not get deported back to the Ukraine. However, Tom Clarkson soon hears of the event and rushes to the registry office and was even prepared to chase after Danilo's brother after he makes a run for it. Tina was then arrested.
In S8E19, Tina hitchhikes up to Greenock (having misspelt it "Greenok" on her cardboard) where she encounters Imogen Stewart on a run. She informs Imogen to find Scout in her lunch break. At first, Scout rejects her mother, not forgiving her from the situation with Danilo but she then sees that her mother is sleeping rough and finds her a place to sleep in a storage cupboard in the School House.
In S8E20 Tina suddenly coughs up blood and collapses, and is rushed to hospital, where she goes into cardiac arrest and dies.