She won silver[1] at the 2000 Summer Olympics in the quadruple scull with her elder sister Miriam Batten, Gillian Lindsay and Katherine Grainger.

In 2003, she set the record for the fastest solo crossing of the English Channel in a rowing shell (Olympic Class) and became the first solo female crossing, in a time of 3 hours and 14 minutes.

This was eight minutes faster than the men's record set by her friend Bob Gullett on the same trip.

On 3 June 2012, Guin was amongst the rowers (with her sister) on the Gloriana (barge) with the Olympic Torch at the start of the Thames Diamond Jubilee Pageant.

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