Spray is better, B&Q. Wilkinsons. Homebase and other Garden type places all sell one form of it or another.

Instead of wasting money on a giant container full of spray which you will barely use, try making your own napalm. Simply disolve some styrofoam in petrol and then apply to the wasps nest before (very carfefully) setting it alight. My hippy girlfriend frowned on this, but the results speak for themselves: absolutely no trace of the little buggers :) (remember to handle napalm with extreme caution!)

That is possibly the worst advice I have seen given on this site for many a long year. For £3. 00 ish you are far far safer buying a can of Wasp Nest Destroyer foam.

such a maligned animal is the wasp. It's a love/hate relationship with me but they are excellent garden pest controllers. I have had some dodgy fun with them & my camera recently ( popped photo's up for a look-see ) I wont do anything to them & they wont do anything to me.