[5] In 2005 Simpson won a silver at the European Cup, despite only competing as a replacement for the injured Kelly Holmes.

[6] Simpson's highlights of the 2006 season were taking sixth place in the 800 metres final at the 2006 Commonwealth Games[7] and finishing second at the British Championships, behind Rebecca Lyne.

She finished 2006, being the fifth fastest British athlete over 800 metres, behind Rebecca Lyne, Susan Scott, Amanda Pritchard and Marilyn Okoro.

Like Simpson fellow British athletes, Marilyn Okoro and Jenny Meadows both failed at the semi-final stage having finished second in their respective heats.

[9] At the start of the 2010 outdoor season, she set a 1500 m personal best of 4:06.39 at a meeting at Occidental College, in the United States.