Guinness led to a scandal and criminal trial concerning the artificial inflation of the Guinness share price during the takeover bid engineered by the chairman, Ernest Saunders. A subsequent £5.2 million success fee paid to an American lawyer and Guinness director, Tom Ward, was the subject of the case "Guinness plc v Saunders", in which the House of Lords declared that the payment had been invalid. In the 1980s, as the IRA's bombing campaign spread to London and the rest of Britain, Guinness considered scrapping the harp as its logo. The company merged with Grand Metropolitan in 1997 to form Diageo.
Guinness share-trading fraud of Lyons, who was suffering from ill health, served prison sentences. The case was brought by the Serious Fraud Office. The defendants bought shares in Guinness plc to enable Guinness (by supporting its share price) to take over Distillers, a much larger company. The Distillers board favoured Guinness as partners and were facing a hostile bid by Argyll. The Guinness executives guaranteed without limit the defendants' losses if the value of their Guinness shares dropped; this gave the defendants an unfair advantage in what should be a fair market. The prosecution relied on a new law; the defendants claimed that