Police hunting for Michael Cope over the murder of his ex-girlfriend Linzi Ashton urged him to give himself up.
Superintendent Kevin Mulligan warned: "If anyone is harbouring this individual, they will be prosecuted."
He added that Cope had a "history of violent behaviour".
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The PM promises to double to 200,000 the number of homes built under an existing scheme aimed at easing Britain's housing shortage.
The Met Office has weather warnings in place for snow and ice until 10am in the north and west.
The plan, which would effectively strip banks of the benefit of recent corporation tax cuts, forms part of the party's election manifesto.