Therefore he must have left in a vehicle.
There were only 4 vehicles within the timeframe the Police consider important - 3 cars and a bin truck.In the papers today it said the 3 cars have been discounted, that leaves the bin truck.
The phone "pinged" the masts on the route of the bin truck within the appropriate time frames.
It would therefore seem likely that the phone was travelling with the bin truck (note I didn't say in the bin truck).
I agree that he must have left in a vehicle, but I don't think it was from the HS. Do you have a link for the paper that says about the cars being discounted please? I've not been able to find it.
I didn't think that they were certain that the phone took the same route as the bin lorry.
MOO is that he left the HS bit and went into SB loading bay where he was picked up. They possibly stopped off at Tesco on the way and left there at a time that may have coincided with the bin lorry. From that the phone was either still with C or he had been dropped off at some point along the way, phone fell out of pocket and the driver didn't or hasn't noticed it. I lost something in my car for several months and eventually found it under the seat.