Rubuta ci gaba don wannan sakin layi - Harmsworth ya kasance mai karɓar lambar yabo a gasar zakarun Turai ta Indoor Athletics ta 1987
, na uku a cikin mita 400, kuma ya gama a matsayi na biyar a gasar zakarun duniya ta IAAF ta 1987, inda ya kasance na farko a Turai. A matakin kasa, ya kasance zakaran Burtaniya a cikin gida a wannan shekarar. Ya kasance zakaran matasa na Burtaniya a shekarar 1980. Ya kuma kafa rikodin Burtaniya da na Commonwealth a cikin gida a cikin 4 × 400 m a 1987, kuma a waje a cikin 4 × 200 m a 1988.