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Harriet Harman pulled out of her planned interview with James Churchfield on ´óÏó´«Ã½ Radio Cornwall's Breakfast Show this morning. Nothing personal, I'm assured, she had planned to do a series of local radio interviews and cancelled them all. There was a similar disappointment with Ed Balls on the first day of the election campaign.

But following visits to Cornwall by David Cameron and Nick Clegg, and with apologies to a couple of junior ministers who are not yet household names, the absence of a Labour Big Hitter is starting to look obvious.