OREANDA-NEWS. A.M. Best has affirmed the financial strength rating of A- (Excellent) and the issuer credit rating (ICR) of “a-” of TOWER Insurance Limited (TIL). A.M. Best also has affirmed the ICR of “bbb-” of the ultimate parent, TOWER Limited (TL). The outlook for each rating remains negative. Both companies are domiciled in New Zealand.