Posted: 14/05/2015 at 07:55
I believe they are insecticides based on Pyrethrum which is extracted from Chrysanthemums and considered organic. The RHS have a list of products based on this in their 'pesticides for home use' pdf, here, for anyone looking (see page 3):
Vitax PY and Scott's Bug Clear are commonly available brands in the UK.
Yes I know them - but not Bug be gone - I wondered whether it's a different formulation due to different regulations elsewhere, or whether it's something new likely to be (or already) introduced in the UK.