Heard part of the mayday call whilst crewing in for my flight on Tuesday morning. Called as an engine failure by the flight lead, who sounded remarkably calm under the circumstances. Not sure exactly where they were at the time, but lead asked for the wx at Shawbury, so presumaby they were at either med or hi level transit within gliding distance. Overrun barrier engagement would suggest engine out or no hydraulic landing with no brakes, and no chute on a Hawk.