Try sprinkling a substance called Brushwood or Root Out (available at Woodies) on the cut stumps; having first scored the stumps with a hack saw or something to allow for better penetration of the stuff. It's a good idea to then cover the stump with black plastice for a few weeks; this make sure it's not washed away and prevents light entering. I was successful in removing old hedging with this method.
Took me the best part of two full weekends to rid out back wall (probably c. 8M wide or maybe less) of two ivy trees that had been growing since we moved in over a decade ago. What an ordeal! Still haven't gotten around to killing the roots though.
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