Mr Cameron, 37, whose 28-year-old wife is due to give birth to their first child in June, said: "We feel incredibly lucky - we almost didn't go for it. It was only the third broker we approached who flagged up this deal. We look at our mortgage statements now and they look ridiculous, it's fantastic." A handful of lenders, including Halifax, offered two-year trackers at between 0.51 and 1.01 per cent below the base rate in the last half of 2007.