In message , bigboard
writes
Normally I would say don't bother buying worms as they will find their
own way in. In a plastic dustbin however, it may well be worth your
while to introduce them. Like others have already said, your heap is
decomposing anaerobically, which is why it stinks. Worms won't like
these conditions, and I would suggest that as well as adding cardboard,
newspaper, etc to the bin to increase aeration, making some holes in
the bottom to allow excess water to drain. I know you said it's not too
wet, but the bottom contents of the bin get saturated and rot
anaerobically if there is no drainage.

A bous to doing this is that compost worms will find their own way into
your bin when the conditions are right for them. I took the lid of one
of my compost bins last night, and the top was literally writhing with
worms. Lovely! And I haven't bought any.

I always thought that you had to put a plastic bin upside-down, so the
bottom of the compost is in contact with the soil, cut a hole in the
bottom (now the top) to put the materials into, then put the lid back on
....
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Klara, Gatwick basin