VX wrote:
I've been using a compost bin and putting all garden waste in them and also
kitchen waste that seems to be the same sort of thing, ie plant material
only. This means in addition to prunings etc from the garden I also put in
salad leftovers, vegetable scraps (uncooked), banana peel, rotten apples and
apple cores, used teabags, and not a lot else.

In warm weather there is a steady prescence of tiny flies in and around the
bin, along with a few wasps. The tiny flies pose a real problem since windows
are nearby- so I need to either stop using this type of composting, or if
possible change what gets composted to remove the fly problem.

But I have a feeling that these tiny flies will be hanging around whatever I
put in the compost bin. They seem to hang around bags of commercial compost
and even potted plants that are planted in compost!

Can anyone clarify this for me- is there any restriction on what material I
compost that would mean I no longer get these tiny flies in attendance?

They are fungal flies and they live on the mould that occurs during
decay. You need to be careful that you are not not growing any pot
plants nearby as these flies are also attracted to the compost in them.
You then get hundreds of tiny translucent maggots in the compost which
attack the roots of the pot plants.