Three times world heavyweight champion Cassius Clay - later Muhammad Ali after his conversion to Islam - is one of the greatest boxers of all time. On Tuesday he turns 70, although the celebrations have already begun, with the first of five birthday parties planned for the year ahead having made headlines in the US last Saturday. Its many years since Ali was seen in the ring, but despite his age and continuing struggle with Parkinson's disease, he remains a charismatic figure who commanded the attention of the worlds media throughout his fighting career. Tonight, ITV1 is screening When Ali Came to Britain, a documentary about the boxers many visits to the UK.
