"piece" means an item or portion. If "work" (in the relevant sense) was countable rather than uncountable, then "a piece of work" would mean "a work" (which in reality is incorrect English, in the relevant sense). While "piece of work" is OK in itself, "I have an urgent piece of work at home" sounds slightly odd to my ear.
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GPYI will overlook the rather awkward repetition of "attend" that this would create in the sentence as a whole).Thanks for your reply.
silak12But I don't get the quoted part above. What kind of repetition?But I regret to say that I will not be able to attend because I have some urgent business to attend to at home.