Ben Ransom of Saracens wears an impact sensor behind his ear to help determine the effects of possible concussion during the Aviva Premiership match between Saracens and London Irish at Allianz Park on Saturday.  Photograph:  David Rogers/Getty Images

Saracens players wore sensors to measure the force and direction of impacts to the head during Saturday’s victory over London Irish. The gadgets, used(...)

Wales captain Sam Warburton in action against England in last year’s Six Nations. Photograph: Alex Livesey/Getty Images

English club chiefs would be “highly unlikely” to ratify the Welsh Rugby Union (WRU) loaning a host of top stars to Aviva Premiership clubs, accordin(...)