known owners:
Healey Motor Company
J.R. Brown Motors Edinburgh April 1952 – 53
John Cuff 1953 – 55
unknown owner
Chris Marshall 1959
Colin Noble 1959 – 64
C. Mutsaars 1964 – 70
Hugo Russell 1970 / stored for 22 years
Percy Powell 1992
_ _ _ _ _ _ , England

Events:
more information on RacingSportsCars
1950 Silverstone Production sports car race driver: Duncan Hamilton
1950 Alpine rally driver: Wilkins St.Nr.: 110
1950 Mille Miglia, team: Mosters and Count Caslebarco, 38th overall, 8th in class
1952 used by John Brown himself, he competed in Hill climbs and races
1953 RAC rally driver: John Cuff
1960’s raced by Colin Noble
2009 26.July 60.birthday Healey Silverstone at Silverstone

Literature:

Internet: Film Mille Miglia 1950, look for JWD 1 at minute 40:07

Appendix:
Description of the history from Chris Berens you find at the pics.
für Gazette 47 / Association of Healey Owners

• Listing ID: 1097
• Chassis: E53
• Reg. Nr.: First Reg.No.: JWD 1
  HKW 542
  BSV 307