I use the dalek type ones bobnewboy mentions. They're cold heaps and are full of brandling worms. It takes about six months to make really, really good rich black friable worm worked soil from anything organic that goes into them.
I even rinse out the milk bottles into them. The worms love that…..apparantly they thrived in byres under the straw where cows lay down to chew the cud and leaked a bit from their teats.
The worms are gatherable from our bins in handfuls of writhing knots that weigh near a kilogram.
I'm pretty sure we had at least one rat visiting this past month, but Himself emptied the heap and re-started it with the top unrotted layers and there's been no sign of ratty since. Rather relieved at that
In season they get the grass cuttings, the prunings of the dried reeds and rotting waterlily leaves from the ponds, and the leaf litter sweepings from the garden and paths. We have a shredder and anything woody goes through that and into the heaps too. So do things like egg boxes (and egg shells) and spent compost from plant pots. I just keep layering stuff into the top and brilliant soil comes out the bottom
Our garden is on heavy blue clay (local clay quarries still make brilliant bricks, but it used to be used for fancy tiles) and it devours organic matter. It's the only way to keep the soil open, so we compost everything we can.
We tried the brick built ones with slatted fronts and wooden boards for lids, and they just didn't work. It took near three years for the stuff to rot down. The black plastic daleks are brilliant
and the Councils give them out to folks who ask for a few pounds
M