noticed several weeks back that it like a blunt nail was pressing into my back, half way up the back rest! thought that the cushion/padding had worn down so ordered a new one yesterday from volksrange up in teeside. Anyhoo took the seat out this afternoon, pulled off the upholstery cover and found out that one of the metal rods which attaches the upholstery to the padding via ringlets, had pulled out of the foam and no longer sitting in the recess. all sorted now - just a real pain uncrimping about 20 ringlets and then having to refit and recrimp them, to detach/re-attach the upholstery cover!!!! all in all it was much eaiser than I thought (thanks to my dad's help!) and only cost £20 for a new cushion.