If David Cameron had any sense, he would call a referendum on Europe now | Simon Jenkins

With Ukip and now Nigel Lawson roaming free, he'll only regain the initiative on Europe if he calls Nick Clegg's bluff

The UK Independence party is mid-term political froth, here today and blown away tomorrow. The only matter of interest is whether it froths enough to destroy a major party leader, David Cameron, as the SDP did Michael Foot in 1983. But if Ukip is froth, yesterday's intervention by Nigel Lawson is a different matter. The former chancellor may be years out of office, but he...