Leigh Halfpenny joins Scarlets to give Wales and Warren Gatland a boost

• Wales full-back signs national dual contract after leaving Toulon• Halfpenny will be available for 2019 World Cup under selection policyLeigh Halfpenny has signed a three-year contract with the Scarlets, bringing an end to months of speculation over the Wales and Lions full-back’s future.Halfpenny has agreed a national dual contract with the Pro12 champions and the Welsh Rugby Union, having reportedly turned down an offer to rejoin Cardiff Blues. Halfpenny, who has also been linked with a move to Wasps, Bath and Leicester, was surprisingly cut loose by Toulon at the end of last season and wa…