"Bobby" wrote in message
...
I'm going to build a wormery using a wheelie bin, which will stand in my
back yard.

However, what do people do with them in the winter? Do the worms freeze
or do people bring them inside the house?

I have had a wormery (about 100L without insulation) for the last three
years in which the worms survived each winter.
I assume that the continual addition of stuff throughout the winter and the
generation of some heat by the traditional composting process helps the
worms. When we have an old traditional hard winter then things may be
different.