Proportion of sites affected by different pressure combinations in river types: A = Headwater, B = Downstream, C = Greyling, D = Salmon, E = Mediterranean, F = Lowland. Unimpacted/slightly impacted (no/slight pressure), water quality pressures only (W), hydromorphological pressures only (HMC) and a combination of water quality and hydromorphological pressures (W + HMC).