HOW THE CONTROVERSY UNFOLDED

■ BRITISH cyclist was drug tested in 2010 and his sample was found to contain traces of nandrolone, a banned performance-enhancing substance.

■ UK Anti-Doping (UKAD) tipped off British Cycling about the anomalous sample.

■ BRITISH Cycling tested a group of riders again at a laboratory not accredited by the World Anti-Doping Agency (WADA) after UKAD gave them clearance.

■ THE riders’ samples are understood to have come back negative but UKAD have no record of the results.

■ WADA are now investigating why UKAD allowed British Cycling to carry out private testing instead of conducting their own investigation.