LONDON— Shares in Cable & Wireless Worldwide PLC have dived after Tata Communications Ltd. ruled itself out as a takeover bidder, leaving Vodafone as the only potential suitor. Cable & Wireless Worldwide shares were down 23 percent in morning trading in London. Disclosing its intentions a day before Thursday’s deadline for making an offer, Tata said it had been unable to agree with CWW on an offer price. Vodafone had no comment. C&W Worldwide, created in 2010 following a demerger, operates a cable network serving 150 countries directly or through local partners, supplying telecoms services to businesses and public sector bodies. —AP