1. School of Water Sciences, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK
2. Water Quality Technology Development Department, Yorkshire Water, Western Way, Halifax Road, Bradford, BD6 2LZ, UK
3. United Utilities Service Delivery, Asset Creation—Task Team, Thirlmere House, Lingley Mere, Lingley Green Avenue, Warrington, WA5 3LP, UK