UPDATE 2-Drahi ups stake in BT to 18% drawing defensive response from Britain
* Drahi ups stake in BT to 18%* Drahi says does not intend to make bid for BT* UK says will act if required to defend critical assets* BT says to serve all shareholders (Adds further details)By Paul Sandle and Kate HoltonLONDON, Dec 14 (Reuters) - P...
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