Bristol mark Premiership return with Twickenham opener against Harlequins

• Bristol’s first top-flight match in seven years will be at Twickenham• Champions Saracens play Worcester Warriors in double-headerBristol’s first Aviva Premiership match in seven years will be staged at Twickenham.The Ashton Gate club will kickstart their top-flight return by taking on the 2012 Premiership winners Harlequins in the London double-header, on Saturday 3 September. Saracens, the reigning champions, will start their title defence in the other half of that London double bill, taking on Worcester Warriors. Related: Euro finals, a Nascar pile-up and Kevin Durant feels the Thunder's …