British Prime Minister David Cameron will launch an assault against "business as usual" at a summit in Brussels on Tuesday, calling on his fellow EU leaders to set clearer and simpler priorities that address the concerns of frustrated voters.

After resounding victories for the far-right in Britain, France and Denmark, and a strong performance by populist or Euroskeptic groups in many other EU countries in European elections, Cameron is under pressure to shore up his position at home and deliver on long-promised changes in Europe.