Owen Williams gave the Scarlets an early lead, but tries from Tommy Bowe and Robbie Diack combined with Ruan Pienaar's reliable boot have left Ulster 18-3 up at half time.
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Wales wing George North will leave Northampton at the end of the season after agreeing a national dual contract with the Welsh Rugby Union.
The Finance Secretary has reacted to today's Autumn Budget, saying it provides no significant boost for 'hard-pressed public services'.