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Andrew Lane, the director of Night 'n Day Foodstores which owns the property, said it had taken this long to get all the structural reports, agreement between all parties, including the Historic Places Trust, about how the wall should be fixed, consents in place and contractors lined up.
It was now a matter of specialist workers becoming available, but that was expected within the next few weeks.
It was finally agreed the breccia wall would not be wholly replaced with breccia, but some of the stone would be placed at either end.
The decision came down to cost in the end, as the company had not been able to find funding from elsewhere to support the repair, Mr Lane said.
The level of insurance received would depend on what was found behind the wall.
''Hopefully, it will be straightforward.''
The footpath around the wall was blocked off in mid-December 2011, after the wall began to bulge.