A denial from Shell PLC (LSE

HEL, NYSE

HEL) this morning of last night's Wall Street Journal report that the oil giant was holding "early stage" talks to acquire BP, has not stopped the buzz of speculation in the City of London on Thursday morning. After the UK market close on Wednesday, the Wall Street Journal reported that Shell was holding "early stage" talks to acquire BP, with the discussions described as "active" with BP "considering the approach carefully.