On a holiday to Tunisia in 2015, Tanya Borg's ex-husband Mohammed El Zubaidy smuggled their children across the border to Libya - where they've been kept at their grandmother's ever since.
Ms Borg has tried in vain to get the Foreign Office to intervene in her fight to get her daughters, Maya and Angel, home to Wiltshire.
But after five years of dead ends, including court cases which ordered they should be sent home, she is now determined to ensure her plea for help reaches the UK Government.
Today (Friday 23) she began a fundraising walk to London where she will deliver a letter to No 10 Downing Street.
A socially-distanced gathering with banners, t-shirts and signs as Ms Borg set off along the canal by Pewsey Wharf.
She is taking on the challenge with sister Christina Borg and friend Hannah Diskett.
She said: "We are planning to walk all the way to London along the canal and the Thames to raise awareness about my girls, who have been abducted by their father and kidnapped by their grandmother.
"They are being held hostage and don't want to be there. I am doing this to raise money so I can get the funds to help get my girls home."
Ms Borg has been granted full custody of her children in both Britain and Libya, and judges have jailed El Zubaidy twice for breaching orders to get Angel and Maya home.
Tomorrow (Saturday October 24) Maya will turn nine - which will be the fifth birthday in a row she has spent without her mother.
Ms Borg has had no contact with her daughters since March 2017.
Ms Borg added she was desperate to give her children the "biggest cuddle."
Ms Borg added: "I have no plans to give up, I cannot give up. They are my girls and they have no-one else fighting for them."
If you would like to support the walk and Borg family, visit https://www.gofundme.com/f/tzjsh-help-me-get-my-girls-home