Butterflies don't bite or sting and they are very photogenic. Find a good flowering bush or a shrub, stand still, set your camera to macro and fire away. Along with the butterflies you might see bees, beetles and other insects after the pollen, or predators such as hornets and dragonflies that are after the other insects.
You may see some migrants such as Painted Ladies and Hummingbird Hawk-moths, both of which we have seen at Paxton this month.
Go to http://www.bigbutterflycount.org/ to get the full details.