Sally and Sarah Kettle's 3,000 mile trip could take more than 70 days

Sally Kettle, 26, from Brighton, and her mother Sarah, 45, from Northampton, are heading off from the Canary Islands to raise money for an epilepsy charity on Tuesday.

Back in October, Sally and her partner Marcus Thompson attempted the challenge but they had to turn back when Marcus was sea sick which triggered an epileptic seizure.

If Sally and her mother are successful they will be the first such team to row the Atlantic.

Sally and Sarah Kettle will cross the Atlantic in a 24-foot plywood boat

They are competing in the Ocean Rowing Society's Atlantic Regatta.

The pair have been in La Gomera since the New Year preparing themselves and their 24-foot marine plywood boat, Calderdale - the Yorkshire Challenger, for the voyage.

Sally said she and her mother had been able to row every day building up their strength and getting used to the sea conditions.

"We both now feel confident in our abilities and the boat," she said.

Sarah added that neither of them envisaged any problems in their relationship during the trip.

The event is one of the world's toughest rowing challenges and covers 3,000 miles to the West Indies.

The journey could take more than 70 days to complete.