Britain's FTSE 100 hits three-week high as banks, Kingfisher rally
* UK's top share index up 1.4 pct * RBS leads banks higher * Old Mutual gains after confirming approaches for stake * Coca-Cola HBC hit by stake sale (Adds detail, updates prices) By Kit Rees and Alistair Smout LONDON, May 24 (Reuters) - Britain's top share index r
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