By Simon Falush LONDON, Nov 18 (Reuters) - Britain's top share index fell 1.6 percent on Tuesday, as news of hefty job cuts from Citigroup (nyse: C - news - people ) and continued gloom on the global economy offset the positive impact of some better-than-expected corporate news. By 0903 GMT the FTSE 100 was down 67.35 points at 4,064.81 after falling 2.4 percent in the previous session. ICAP rose 2.3 percent after it said its full-year

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