It is great to have some hot, dry weather in the UK lately instead of our usual rain filled grey skies! It gave me the chance to get out into the garden, if not to work then at least to sit in it. I always find it relaxing to watch the bees extracting the pollen from the flowers. However, such weather also brings a couple of unwelcome visitors, namely flies and wasps. They can be as troublesome as cement blocking in a silo or fly ash building up on boiler tubes.