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Cracked Retaining Walls

I have 35 meters of old terraced hollow concrete block retaining walls, that are cracked and leaning forward. I'm guessing that the walls are are as old as my house (60 years) and vary in height from 0.5m to 1.6m along their length, on a sloping part of my back garden. Some of the cracks have been repaired in the past with thick steel straps bolted on. I am looking for quotes to get the walls repaired or replaced.