United Utilities on Friday said it had traded in line with its expectations in the four months to late July, with an increase in revenue partly offset by the previously announced special customer discount of around £20m that has been applied to this year's bills. It said its capital investment programme was progressing well which has continued at high levels as it invests to maintain and improve services for customers and deliver further environmental benefits. A statement from the company read: "We continue to deliver improvements in customer service, underpinned by good operational performance. The water and sewerage companies have now published their 2013/14 Ofwat key performance indicator reports and we are pleased to report a top quartile performance across this range of operational metrics. "In addition, companies have recently published their overall service incentive mechanism (SIM) scores for 2013/14 and we have achieved an above average score across the industry on this measure, representing continued year-on-year improvement."NR