The helicopter crash in Norfolk which left four people dead happened near a stately home owned by one of Northern Ireland's richest men Lord Ballyedmond.
The peer is the chairman of Norbrook, one of the largest privately owned pharmaceutical company's in the world, and he also owns Gillingham Hall.
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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.