The past few hours from me have been feeding two possible theories:
1- That the HS and all parties in and around could be irrelevant because there is a perfectly logical reason as to how the phone ends up in the wagon but not via HS bin. This reason is that he met somebody between 0324 and say 0415 who disposed of the phone in another Biffa bin. A prime example being the bin for the other Greggs, on a route he could have walked to a very common meeting point. The bin is then collected by the same wagon etc.
2- Secondary I will try and simplify. 450AM BM ping is not as a result of the lorry carrying the phone, it is the phone arriving earlier in BM in an "power off" state and then being turned on, at 0450. If we go with this then realistically we have a period of 0308-0450 when the phone could go to BM.
Now why do I believe this to be potential? Well simply 28 minutes is too long to get from the last possible BSE ping (Flempton area) to the first BM (Icklingham). Remember, a ping does not identify you as being in anything other than a 5 mile radius. In reality the goodbye and hello pings should only be 5 minutes apart, therefore 28 minutes is just not relevant to anything at all unless it took 28 minutes to.drive the distance from Flempton to Icklingham, but even then the departure time from HS is massively wrong The phone clearly goes to inside the BM mast but the time and method are not at all concrete and this is why the landfill was not searched.
JMO