[omits]

I quote: "Site supporter Harrod Horticulture sell effective soft 7mm butterfly netting which is UV stabilised.."

I have watched these blighters sit on top of a 7mm net and flip themselves inside. One needs a 5 x 7.. or smaller to stop them getting in this way. They usually find a way in esp along the base or at a join or even if the netting has torn.

Other views welcome.