1987
Represented North Warwickshire Pony Club Dressage Team at PC Champs, Weston Park
1988
Represented North Warwickshire Pony Club Event Team at PC Champs, Weston Park
1989
Junior Final Trial - 3rd
As a result, was then the youngest person ever selected to represent GB at Junior European Champs, Lausanne, Switzerland
1990
British Junior National Championships, Windsor - 4th
Junior Final Trial - 1st
As a result, was member of GB Silver Medal winning Team at Junior Europeans, Vittel, France
1991
British Junior National Championships - 8th
Member of GB Gold Medal winning Team and individual Bronze Medallist, Junior Europeans, Rotherfield Park, GB
1992
Irish Junior National Championships, Punchestown, Ireland - 1st
British Junior National Championships - 8th
Represented GB Junior Europeans, Langenhagen, Germany
1993
British National Young Rider Championships, Bramham - 4th
Selected for GB Young Rider European Team but horse went lame week before Champs.
1994
Young Rider European Championships, Blenheim - Completed
1995
Rebuilt team of horses after retirement of Junior & Young Rider horse
1998
Windsor CCI** - 6th
1999
Windsor CCI** - 8th
Bramham CCI*** - 17th
Burgie CCI** - 17th
Weston Park CCI** - 4th
2000
Badminton CCI**** - Completed
Weston Park CCI** - 6th
2001
Bonn-Rodderberg CCI***, Bonn - 18th
2002
Badminton CCI**** - Completed
Burghley CCI**** - Completed
Blenheim CCI*** - 17th
Necarne CCI* - 6th
2003
Badminton CCI**** - Completed
Bramham CCI*** - 15th
Cavertitz CIC*** German Final Trial - 9th
Competed as member of German Team European 3-Day Event Championships, Punchestown, Ireland
Aldon CCI* - 2nd
2004
Luhmuhlen CIC*** - 20th
Weston Park CCI** - 1st
2005
Sansaw CIC** - 1st
Bramham CCI*** - 6th
Luhmuhlen CCI**** - Completed
Kreuth CCI*** - 8th
Kreuth CCI*** - 11th
First Reserve: German Team European Championships, Blenheim
2006
Burnham Market CIC*** - 10th
Burnham Market CIC*** - 5th
Chatsworth CIC*** - 4th
Luhmulen CCI**** - 9th
Schenefeld CIC*** German Final Trial - 15th
  Blenheim CCI*** - 17th
  First Reserve: German Team World Equestrian Games, Aachen
2007
Burnham Market CIC*** - 5th
  Chatsworth CIC*** - 8th
"Stef always demonstrates a totally professional attitude towards her sport and combines an obvious natural talent with the mental toughness required to produce a winner. Stef is very much in the top flight of international competitors and together with her team mates has a realistic chance of achieving a medal at the Olympic Games."
Christopher Bartle