LONDON--The Greek election will "increase economic uncertainty across Europe," a message from U.K. Prime Minister David Cameron's usual Twitter account said on Sunday. "That's why the U.K. must stick to our plan, delivering security at home."

Mr. Cameron, who is campaigning for a general election in May on a platform of further fiscal austerity measures, has warned in the past of the risks of large budget deficits like those of southern European countries like Greece.

Greek's antiausterity Syriza party is on course to win the country's general election.

Write to Nicholas Winning at nick.winning@wsj.com

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