Saffron Walden County high and Newport Grammar catchment areas?

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Hi
Am currently contemplating a house move and our eldest is about to start primary school so am thinking way ahead of myself. Does anyone know the catchment areas for these two schools? At the moment we are definitely in Newport catchment but not sure about county high. Is county high much better then newport and does anyone have any views on either school not just in terms of academic reputation but the overall view of the school?
TIA