THE three-year-old son of a man known as the Lockerbie orphan has inherited the bulk of his father's #1.5m fortune.

Luke Flannigan will not receive his legacy until he is 25, but by then it could be worth between #8m and #10m.

Details of the estate are revealed in Steven Flannigan's will following his death in a railway accident almost a year ago. He and his elder brother, David, became known as the ''Orphans of Lockerbie'' after their parents, Tom, 44, and Kathleen, 41, were killed with their younger sister, Joanne, 10, when the wreckage of PanAm flight 103 crashed into the family home in December 1988.

Between them, the brothers were awarded compensation of more than #2m. But David Flannigan, who was 18 at the time of the disaster, could not cope with his sudden wealth. He spent huge amounts of cash on alcohol and drugs.

In December 1993, he died of heart failure while on holiday in Thailand. Steven, four years David's junior, promised to invest wisely his share of the compensation. He leaves a #1.5m fortune in property, Treasury bonds and an impressive shares portfolio.

Luke, the result of a relationship between Mr Flannigan and Lisa Gregory, will inherit most of the fortune on his 25th birthday. Before this he will receive a car when he passes his driving test and a modest sum of cash when he is 21.

The bulk of the estate will be held in trust by Steven's uncle, Lawrence Doolan, who lives in Australia.

Mr Flannigan also left #10,000 each to 12-year-old Lockerbie twins Rachel and Hannah Prothero. He was their godfather, and came to regard the Protheros as his new family. The girls will receive their legacy on their 18th birthdays.

Luke's mother has since married Jim Nesfield, a gamekeeper. They live on a farm outside Lockerbie. She declined to comment on her son's inheritance.