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allocation per call and a range of time measures for different call types for 1 year before and 7 months after implementation, and used time series regression models to compare changes between intervention and control sites adjusted for seasonality, call volumes and hours lost at hospital handover. Results The proportion of emergency calls responded to within 8 min increased by 6.6% in the intervention group. The 95th percentile time from call connecting to EMS and a resource arriving on scene reduced by 9.45 and 166.6 s for life-threatening and emergency calls respectively. There was a statistically significant reduction in average resources allocated per incident of À0.1 for life-threatening calls, À0.06 for emergency and À0.12 for urgent in the intervention groupequivalent to an additional 10 243 whole resources available to respond per week in England. There was no change in service re-contact. Conclusion Additional call triage time does not lead to a reduction in response time performance, improves efficiency of resource use and is safe for patients. Conflict of interest None Funding NHS England.

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