May 10 (Reuters) - Aviva PLC:
* CHIEF EXECUTIVE MARK WILSON SAYS AVIVA HAS AROUND 500 MILLION STG TO SPEND ON "BOLT-ON" ACQUISITIONS
* CHAIRMAN ADRIAN MONTAGUE SAYS AVIVA CEO WILSON'S DIRECTORSHIP OF BLACKROCK ARRANGED "VERY CAREFULLY" TO AVOID CONFLICT OF INTEREST Further company coverage: (Reporting By Carolyn Cohn)