The London (UK) Ambulance Service has confirmed press reports that last October a computer glitch prevented some emergency 999 calls from ringing in to some calltakers, the result of the change from British Summer Time. According to the Health Service Journal (reg.), over 70 emergency calls were not answered during a 25-minute period on October 30th. Apparently they became invisible on-screen when the “fall back” fall time change was implemented. However, the technical staff were able to identify all of the missed 999 calls, and ambulance service officials said no life-threatening patients were affected. Read more about the incident here.