More than one in ten TV adverts for gambling have broken advertising rules, according to the Advertising Standards Authority (ASA).
Of the 56 advertisements checked, the ASA found that five promoting gambling websites could appeal to children and young people.
A sixth TV advertisement was found to suggest that gambling could improve self-esteem, self-image and help achieve financial security.
The Government relaxed rules for gambling advertising in 2005. Under the Gambling Act 2005 casinos, bookmakers and gambling websites are allowed to advertise on television, subject to certain restrictions.
According the Gambling Commission, gambling adverts must not: