So what the hell happened here and how would the unbiased viewer apportion blame?
Driving to work in my wife's car, just had time to think "That Transit's pretty close" and BANG! £400 down the pan. We were certainly not over the white line (although could have been further to the left I admit), but it doesn't appear as though they were either - although if you pause the clip their mirror does look in line with the centre markings. Thing is, I reckon the Transit mirror is higher than ours so would not have hit, so was it the sides of the pickup back? In which case how did that happen without their mirror clipping the car body itself?
Problem is the video is no proof we were on our side, and no proof they strayed onto ours. All that can be said is that we didn't suddenly jink to the right, but neither is there any sign that they did so, so I can't see an insurance company saying anything other than 50/50 liability.
It is very clear to me what happened here. The noise occurs before our knacker friend arrives and the passenger can be heard to shout 'DUCK'! Therefore, I would deduce that you were hit by flying wildlife of the Mallard type and not by our road going friend. Case closed.