Oil heavyweights, exporters guide FTSE 100 close to seven-month high
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(Reuters) - London's main index sprang to a near seven-month high on Tuesday as oil majors leapt on the back of tighter U.S. sanctions on Iran and exporters benefited from a weaker pound as Brexit jitters returned.The FTSE 100, whose components earn a large chunk of their revenue from outside the UK, jumped 0.9 percent, with further support from an upbeat Wall Street. The FTSE 250 added 0.3 percent.Shell rose 2.2 percent to a six-month high and BP gained 2.6 percent as oil prices rose in..