Posted: 23/08/2016 at 19:41
Hi Max, got mine from screwix which is handy if you have a local one but googling "100 x 2.5mm cable ties" gets them cheaper (watch the delivery charges though!)
I overlapped the sections of netting by about 2" as you can use fewer ties that way.
As far as butterflys getting in goes, they will find any holes large enough (commercial butterfly netting has holes of 7mm or less) - I've watched them fly around and around every section of my nets looking for a way in! They'll also lay eggs through the netting if any brassica leaves are touching it.