LONDON–(BUSINESS WIRE)–A.M. Best has affirmed the Financial Strength Rating (FSR) of A (Excellent) and the Long-Term Issuer Credit Ratings (Long-Term ICR) of “a+” of the rated insurance subsidiaries of Aviva plc (Aviva) (United Kingdom). Concurrently, A.M. Best has affirmed the Long-Term ICR of “a-” of Aviva, the group’s non-operating holding company. At the same time, A.M. Best has affirmed all Long-Term Issue Credit Ratings (Long-Term IRs) on debt instruments issued or guaranteed by Aviva.