British sports betting operator Stanleybet has threatened to sue Greece for lost revenue in a long-running legal battle over their gambling monopoly firm OPAP. Stanleybet accuses Greece of tacitly rejecting its 2004 request to offer sports betting in the country and said on Wednesday it had told the government and OPAP it will seek damages of about 240 million euros. OPAP, one of Europe’s biggest gaming companies, has a monopoly in offline sports betting and lotteries in Greece until 2030. Athens agreed earlier this month to sell a controlling stake and management rights in OPAP to Greek-Czech investment fund Emma…