UPDATE 2-UK shares weaken, Tullow loses half its market cap
* FTSE 100, FTSE 250 down 0.1%* Tesco outshines the main index* Some domestic stocks gain on election optimism* Tullow Oil plummets after co cancels dividend, CEO exits (Adds company news items, updates share moves)By Muvija M and Shashwat AwasthiDe...
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