Data regarding the urea reduction ratio (URR) were available for analysis from 63 renal centres and 74% of the prevalent haemodialysis (HD) population in the UK. Fifty-one centres provided URR data on more than 90% of prevalent HD patients. The proportion of patients in the UK who met the Renal Association (RA) clinical practice guideline for URR (>65%) has been stable between 88-89% since 2011. The median URR has been stable over the same period (75%). There was persistent variation observed between centres, 15 centres attaining the RA clinical practice guideline in >90% of patients and 42 centres attaining the guideline in 70-90% of patients. Over 95% of the prevalent HD population received dialysis three times a week but 26% did less than four hours per session. Median URR was similar between patients irrespective of dialysis session duration.