Swindon Stadium have notified GBGB of a change of race distances as a result of a survey carried out last week.
The sprint distance will now be 262m. The Stayers distance will now be 682m. The circumference of 420m and the Standard distance measurement of 476m remain the same.
All formlines with the previous incorrect distances of 250m and 670m will be amended to the updated race distances on the national form database in the coming days.
GBGB will be investigating the circumstances that have led to this error.