Parents could soon know exactly what effect violent video games have on children and teenagers with the announcement of a Government-ordered inquiry.

TV psychologist Doctor Tanya Byron"s independent probe comes after a revised version of the ultra-graphic Manhunt 2 was rejected by censors on Monday.

The British Board of Film Classification (BBFC) first banned the game in June, saying it demonstrated a "casual sadism" and "constantly encourages visceral killing".