Thanks everyone. The coffee chaff is papery, a bit like Physalis outer covering, and does not contain caffeine as far as I am aware so if anyone reading this has experience of using it in the garden I would appreciate their advice. My intention was to use it in the compost heap as the "brown" layer, forgetting that during the winter I don't have much "green" stuff to go with it. I get about 5 sacks of it a month. So far I have used it in the compost heap and as a mulch. I will dig in the mulch once I can see where my bulbs are coming through. I've thought of using garrotta or similar to speed up decomposition. Urine might be good but I no longer have willing sons at home. 
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