Posted: 16/10/2013 at 13:55
apologies for my late reply to your reply!! thanks for your answer.
it can't be a systemic weedkiller as only the parts the weedkiller touched have died back but i will follow your advice and fingers crossed for next spring!
and yes, the local policing team are aware of the problems i'm having but it's my word against the neighbours, i didn't see them do anything and, despite me hearing neighbours talking about putting weedkiller on, it's not proof enough!.