The two biggest US cable companies are joining forces in a $45bn (£27bn) deal, creating an entertainment giant with some 32 million TV subscribers. Comcast's merger with Time Warner Cable was confirmed at the start of trading on Thursday. Its offer, which is subject to regulatory approval, is about 17% higher than the company's closing share price on Wednesday. The takeover bid trumps an earlier $38bn (£23bn) offer from Charter Communications, which appeared to concede defeat by announcing: "We've always maintained our greatest opportunity to create value for shareholders is by executing our current business plan. "We'll continue to be...