The woodworm is the larval stage of various wood-munching beetles, including the furniture beetle and the deathwatch beetle.
The problem is not as common as it used to be because, with warmer houses, timbers are drier and less hospitable to the worm. From May to October they begin crawling out of the woodwork.
Treating a half-dozen flight-holes in your coffee table is a simple matter of using an aerosol or liquid woodworm killer. But if there’s worm in any of the structural timbers, seek professional help immediately.