Nationality: England.
Class: Solo.
Family Connection: Jon Underwood (Son).
British Championship: 350cc Second 1980, 1986.
British Best Pairs: 350cc First 1980, Second 1979.
British Pre 75 Championship: 500cc Second 2013, Third 2015, 350cc Third 2009, 2017.
AMCA Pre 75 British Championship: 500cc First 2002, Second 2001, 2004, 350cc Second 1999.
Midland Centre Championship: 500cc First 1997, 350cc First 1985, Pre 75 Third 2006.
South Mids Centre Championship: 500cc First 1976, 350cc First 1977, 1978, 1980, 1983, 1984, 1985, 1986, 1987, 1988, 250cc First 1990, Two Valve First 2005, Pre 75 First 2017.
Southern Centre Championship: Pre 75 First 2005.
Bewdley Bonanza: 350cc Second 1983.
Jon Underwood: Two Valve First 2001, 2002, 2007, Second 2006, 2008, Third 2003, 2004, 2009, Pre 75s First 2016, 2018, Second 2015, Third 2011.
2018: First Fenland; 2017: Second Bewdley; 2016: Second Fenland; 2014: First Bristol, Second Fenland; 2013: First Fenland, 2011: Second Fenland, Heart of England; 2010: First Fenland; 2009: Second Swindon, Fenland x2, 2008: First Fenland, Second Hayes & Southall, Fenland; 2006: First Swindon, Western Classic, Second Woodbridge, Third Leamington, Swindon.