Zurich Insurance Group AG has made a sweetened £8 billion ($11 billion) bid to buy Beazley Plc, an offer that’s won the tentative approval of the UK insurer’s board.The Swiss insurance giant’s revised cash proposal of 1,310 pence a share, up from 1,280 pence last month, has been agreed “in-principle” according to a statement Wednesday. With Beazley expected to pay its shareholders a permitted dividend of as much as 25 pence for the year ended Dec. 31, the total value would be 1,335 pence, or £8 billion, acc ...