41-year-old mother-of-two has battled back from injury . Will take part in London Marathon on Sunday but wo n't race competitively . She set marathon world record on the course in 2005 . But also suffered embarrassment with loo stop in 2003 event .
41-year-old mother-of-two has battled back from injury . Will take part in London Marathon on Sunday but wo n't race competitively . She set marathon world record on the course in 2003 . But also suffered embarrassment with loo stop in 2005 event .