What interesting times we're living in. The unexpected Lib-Dem surge has made this election impossible to call, and at the same time forced both Labour and the Tories to debate questions which they'd far rather ignore. How do they intend to pay down our frighteningly large national debt, for example?

Nick Clegg put the spotlight squarely on Trident in last week's leaders' debate, arguing that £100bn to replace a Cold War relic that has no military value makes little sense at the best of times, let alone when we're facing financial meltdown.