Based in West Sussex, Tattersall runs an event yard, buying and selling horses, as well as bringing on future stars.
Tattersall was practically born in the saddle at the riding school run by her mother. She won her first one day event at eight years old where she was spotted by the selectors of the lottery-funded world class development program. The program continued to support Tattersall, seeing her career take off with inclusion in the Junior GB team where she won two gold medals. Tattersall was included for the first time in the GB 2016 Rio Olympics squad where she rode Quicklook V. She has ridden for her country in previous competitions, including the 2015 Longines FEI European eventing Championships at Blair Castle on the horse Arctic Soul.