**Update**
Call back from police today, they have concluded their investigation with their main concern being no insurance for the time the van was used outwith work hours, turns out the dealer has a policy above and beyond of anything they've seen before, so no breach there. On the excess speed/mobile phone use, they advised that although the footage clearly shows and hears the breach, due to legal requirements they cannot pursue this avenue either, they advised had the camera been facing inward then it would have been "video gold", so there's no further police involvement, accepted and move on.
The van has been into the dealers for the last 2 weeks, due to collect back tomorrow evening after being advised the fault has been fixed, meeting with dealer principal upon collection, see what they're saying next.