' Every winter we are invaded by flies. Has the widespread use of central heating in homes created a new generation of flies that appear in the autumn rather than the spring?'
Ornithologist John An drews , botanist Glyn Jones , and entomologist Paul Whalley confirm there arejio flies on them when answering another batch of listeners' questions.
Introduced by Derek Jones
Producer MICHAEL BRIGHT BBC Bristol
Questions to: Wildlife, BBC, Bristol BS8 2LR