i was involved in a motorway accident in my old car...... a busy saturday afternoon, M25, 75-80mph, fast lane and suffered a major tyre blowout! dead wheel no control what so ever. I shot across the 2 inside lanes and a 2 lane slip road on bare rim and smashed into the crash barrier kerb at probably about 60ish and did a few spins along the sliproad/hard shoulder.
my alloy wheel was sitting at a 45 degree angle to the car afterwards and was being held on by next to nothing. the damamge to the wheel was a 'cheese wedge' chunk missing out of it and that was about it!! (i will upload a picture of the wheel later as i kept it as a reminder of how lucky i was not to of hit anything else or be hit by any of the lorries that were about).
That alloy of yours HAS to be a defect, as mentioned before the wheels are designed to be able to cope with big forces and streeses of accidents. Sent them the letter with the photos and see what they say, they will try EVERYTHING they can to not claim liability but stick with it!!!!!