As Paul said dig out the crown of bramble and you've won.

Bindweed is a bore, but dig out what you can and you might try growing stuff through Mypex for a year or two. You will definately weaken it.... just got to keep at it i'm afraid. The trouble is when you plant long term crops. A good trick there is to train it up a cane then stuff it in a plastic bag and zap it with systemic weedkiller, pop on a laccy band and leave it.

__________________
Advertising is the rattling of a stick in a swill bucket. George Orwell
Paul