UPDATE 2-Insurer Catlin benefits from low London rate exposure
* Net premiums up 6.5 pct to $2.04 bln * Average weighted premiums down 3.2 pct * Pretax profit up 118 pct to $318 mln * Shares up more than 5 pct (Adds COO, analyst quotes; share reaction; details) By Richa Naidu LONDON, Aug 8 (Reuters) - Bermuda-based Catlin Grou
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