George North gives Wales a boost by coming through contact session

• North missed final 10 weeks of last season with concussion• He has been training really well, says Sam WarburtonGeorge North has offered Wales strong encouragement he will be fit for the World Cup. The Northampton wing played a full part in a contact session as Wales trained in public in Colwyn Bay on Tuesday as part of their preparations for the tournament.Uncertainty has surrounded the 23-year-old’s availability after he suffered three concussions in five months and missed the final 10 weeks of last season. He was not risked in the warmup defeat by Ireland in Cardiff on Saturday and is bei…