Wasps can, however, be kept away at

Wasps can, however, be kept away at last far enough away so that you can eat your picnic in peace! Take an empty but unwashed jam jar and add a little water. Leave this some distance from the spot you have chosen for your picnic. Make sure that it is far enough away so that any wasps that are attracted to it do not bother you, but not so far away that they are more interested in your lunch than the jam jar!