The use of urine as an activator is old family knowledge, but is often mentioned on gardening programmes. Using it (discreatly, of course!) as well as human hair trimmings is supposed to put rats off your heap too, but I don't know if this is true. I've never had rats in my compost though.
Most heaps don't attract flys so long as you don't put meat waste on them. Beetles, bugs, worms and even ants are a GOOD thing. They are the workers who break down your grass clippings & old cabbage leaves into black gold. Even a few slugs will do no harm, so long as you ensure that they & their eggs are not spread onto the garden.
MW
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