He was a veteran competitor of the Isle of Man TT with 56 starts, and 12 starts in the Manx Grand Prix (long) road-races held on the 37-mile Snaefell mountain course around the island, also competing in the Southern 100 (short) road-races held on the 4-mile Billown Circuit, near Castletown in the south of the Isle of Man.

Carswell died in Noble's Hospital, Douglas, Isle of Man, on 11 April 2015, after crashing during a practice session at the Jurby Motodrome, Isle of Man, part of a two-day race weekend organised by the Andreas Racing Club.

[1][2] Carswell entered the Manx Grand Prix, a race for amateur competitors, between 1991 and 1997.

In 2007 he raced machines provided by Bolliger Kawasaki, a European World Endurance-racing outfit, gaining a 16th in the Superbike race and 13th in the Senior, in addition to 9th in Superstock and 21st in Supersport classes.

[4][5][1][6] Carswell was a family man who lived in the Ramsey area and worked as an engineer for Manx Utilities,[1] a business providing power, water and gas services within the Isle of Man.