Britain's EU wish list - be careful what you wish for

By Paul Taylor BRUSSELS (Reuters) - Sometime this week, Britain's prime minister will send a wish list to European Union partners, launching a formal negotiation that could lead to the UK's exit from the 28-nation bloc or subtly change the nature of the union if it stays. David Cameron hopes Britons will vote in a referendum to stay if he secures concessions that make the country's membership even more semi-detached than it already is. While eager to keep London in, other EU leaders have to choo