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Most of the damage seems to have been done by 2011. The nature of erosion on most of the North East coast is for it to move back in steps. You get a collapse, the material falls to the base of the cliff and protects it, sometimes for many years. When it finally washes away the sea starts to work on the base of the cliff yet again. The excption is where the cliffs are mostly boulder clay where there is a constant wearing away and the cliff top paths move back every year.