(Reuters) – Consultancy Next Fifteen Communications has terminated its takeover offer of M&C Saatchi after the required majority of the British advertising group’s shareholders did not vote in favour of the proposal at a court meeting on Monday. Amid a bidding war that also previously involved its biggest shareholder, M&C withdrew support for Next Fifteen’s offer of $381 million in June and later warned it might not gain investor support but agreed to reconvene meetings on Oct. 31. M&C also scrapped a general meeting scheduled to vote on Next Fifteen’s proposal after the offer lapsed, and decl…