The LM600 made its competitive debut at the opening round of the 1995 British GT Championship with driver Chris Hodgetts.

[1] Conceived as a more powerful iteration of the proceeding Marcos LM400 and LM500 models, the car was also entered into the 1995 BPR Global GT Series and the 1995 24 Hours of Le Mans with support from Cor Euser.

[2] Despite failing to finish at Le Mans, Hodgetts successfully won the GT2 class championship in British GT at the car's first attempt.

Notably, a GT1 specification of the car named the LM600S was entered for driver Thomas Erdos at the final British GT round at Silverstone.

[6] During the 1999 season, the Marcos Engineering company was sold to a Dutch consortium led by Euser.