Cowan-Dickie ruled out of Six Nations

England rugby union hooker Luke Cowan-Dickie's been ruled out of the whole of the Six Nations with an ankle injury.

His boss at Exeter, Rob Baxter, says he's unlikely to return until the back-end of the season.

Hooker's a problem for England's opener with Scotland, as Jamie George has concussion, meaning uncapped Harlequins forward Jack Walker's likely to start.