Turner stood down for 12 months

Hayley Turner will be unable to ride for 12 months on medical grounds.

The jockey has been sidelined since early in March after suffering head injuries following a stalls accident on the Newmarket gallops. A scan showed she suffered bruising inside her skull.

Turner, who became the first female jockey to ride 100 winners in a calendar year in Britain in 2008, has now been stood down for a year after a meeting with the British Horseracing Authority's chief medical advisor, Dr Michael Turner.

Dr Turner said: "Having carefully studied the results of recent tests and consulted expert opinion, I was unable to recommend that her licence be renewed until 12 months from the date of the accident.

"Hayley has recovered well from her injuries, but you cannot take any chances in cases like this.

"She remains under regular medical review and is due to see her own specialist at Addenbrookes (Hospital) in early June. Hayley is obviously disappointed, but understands my decision."

Turner will not be eligible to renew her jockey's licence until March 3, 2010.