The son of a British couple detained in Iran has said he broke down in tears when he learned of their arrest and has not heard from them in six months.

Craig and Lindsay Foreman were on a "once-in-a-lifetime" motorbike trip around the world when they were arrested in January and later charged with espionage, which the family denies.

Their son Joe Bennett told the BBC: "I want to be crystal clear, my parents aren't spies, they're not political players, they aren't criminals. They're Mum and Dad."

The Foreign, Commonwealth and Development Office said it was continuing to assist the family and raise the case directly with Iranian authorities.