My dad gets them hovering round the pond. He puts washing up liquid and water in a spray bottle and squirts them, always works and doesn't damage any plants.
Alternatively, I like the flame thrower meself. 
Indeed. Sounds SUCH fun ey?

Got plenty of spray cans of stuff for me werk here. I could use one of them and light the spray!
VOILA!

Bit puzzled as to why they seem to congregate in the same place all the time.
If it was a stagnant pond or puddle or summat, or over a stinky drain, then I could understand it, but it ain'tant.

It's really quite simply over a clean but of concrete half way up the garden path.
Most odd.
