Northbound turboprops March 4th
Around 1230 today a turbo-prop trundled northbound across UK Home Counties/Midlands, about FL120ish. It had that 'Antonov' sound. It was followed about ten minutes later by another, then ten minutes after that, another one. Then first one slid briefly through a gap in the clouds - it didn't look big enough for an AN12, but was a bit far off to be sure. Nothing showed up on FR24 or NATS ae.
Anyone know what they were?