Scotland have suffered another injury blow ahead of the Six Nations after hooker Dylan Richardson was ruled out of the tournament by Scottish Rugby on Tuesday, a day after they lost captain Sione Tuipulotu. Richardson, 26, who has made six appearances for Scotland, has suffered a shoulder injury and wing Arron Reed has been called up to the squad. Tuipulotu will miss the tournament after sustaining a pectoral muscle injury during a training session with Glasgow Warriors last week, while lock