Jessica Ennis-Hill unsure of London Anniversary Games participation

Jessica Ennis-Hill says it is "frustrating" that her recovery from an ankle injury is taking longer than expected, after missing the British Championships.

The Olympic heptathlon champion cannot say if she will be fit for the Anniversary Games Diamond League meeting, at London's Olympic Stadium from 26-28 July.

Ennis-Hill is yet to compete this season, but expects to be able to participate in "a couple of competitions to sharpen up a bit" before the World Championships in Moscow from 10-18 August.