MoneySavingExpert.com founder Martin Lewis has said he intends to sue Facebook over a series of scam adverts posted on the site by criminals.

The names of MoneySavingExpert.com boss Martin Lewis and Dragon’s Den star Deborah Meaden were used to falsely endorse a “sickening” cryptocurrency scam, fraud investigators have warned.

One of the stars of Dragons’ Den has helped launch a free smartphone app to teach children about managing their money and financial planning.