** British insurers up after BoE on Saturday approves theircapital calculation models, enabling them to lower costs undernew rules
** BoE's nod means the insurers can use internal models todetermine how much capital they hold to ensure they can meetpolicyholder commitments under EU Solvency II capital rules fromJan
** Approved insurers include Amlin, Aviva,Just Retirement, Legal & General Group, PhoenixGroup, Prudential, RSA Insurance,Scottish Widows, part of British bank Lloyds andStandard Life
** Approved insurers rise up to 1 pct, top performers on theFTSE All Share Life Insurance Index
** Amlin down marginally
** UBS analysts say key details such as capital ratios,target ranges and how Solvency II will impact cash and dividendstrategies remain to be known
** UK's largest insurer Prudential says on Monday it willupdate on capital position on Jan 19, Legal & General to givedetails with its results on March 15, RSA on Feb 25 and Phoenixon March 23
** UBS analysts say residual risks remain, with a number ofkey uncertainties still open, the outcome of which could havematerial implications for capital, cash-flow and dividendstrategies
** Just Retirement says its merger with PartnershipAssurance will close as planned during Jan following itsinternal model approval (Reuters Messaging:noor.hussain.thomsonreuters.com@reuters.net)