The Liège continued as uncompromisingly an open road event run to an impossible time schedule, and remained Europe's toughest rally until 1964, by which time it had turned to the wilds of Yugoslavia and Bulgaria to find traffic-free roads; but in the end the pressures were irresistible. The Coupe des Alpes struggled on until 1973 until it too succumbed, its demise no doubt hastened by the decision of the French motor sporting authorities to select the Tour de Corse as its representative event in international rally championships.
After the crash, an investigative team from the UK Department for Transport Air Accidents Investigation Branch attended the scene in co-operation with Strathclyde Police. The wreckage of the helicopter was removed to Farnborough for further forensic investigation. A report into the accident was published on 12 February 2009. In it, the AAIB did not reach a definite conclusion as to the cause of the accident, stating instead that "the helicopter crashed in a wooded valley while manoeuvering at high speed and low height. It was intact prior to impact, and the available evidence indicated that the engine was delivering power. The cause of the accident was not positively determined. Although no technical reason was found to explain the accident, a technical fault could not be ruled out entirely. However, it is more likely that the pilot attempted a turning manoeuvre at low height, during which the helicopter deviated from its intended flight path; whether due to the pilot encountering handling difficulties, misjudgement, spatial disorientation, distraction or a combination of such events. There were indications that the pilot had started a recovery but, with insufficient height in which to complete it, the helicopter struck trees in the valley and crashed, killing all four occupants."
The main change over that period has been in the cars, and in the professionalisation and commercialisation of the sport. Manufacturers had entered works cars in rallies, and in their forerunner and cousin events, from the very beginning: the 1894 Paris-Rouen was mainly a competition between them, while the Thousand Mile Trial of 1900 had more trade than private entries.
Most of the works drivers of the 1950s were amateurs, paid little or nothing, reimbursed their expenses and given bonuses for winning (although there were certainly exceptions, such as the Grand Prix drivers who were brought in for some events). Then in 1960 came arguably the first rallying superstar (and one of the first to be paid to rally full-time), Sweden's Erik Carlsson, driving for Saab.