what might be the problem , 206 auto?

my pug 206 automatic 52 plate lost all drive , and stalled the engine , losing the power steering , while doing 70 mph on the motorway , the car through the momentum glided to a stop safely on the hard shoulder , there was no loud noises whilst gliding , tried to restart the engine , but it will not turn over the engine , called out the RAC and he checked the timming belt , which was intact , but the engine will not turn over , the starter will work but sounds like it is not engaged with the engine , it just makes a noise like its whirring , did not notice any lights on the dash before the loss of drive , or anything untoward before the loss of drive.