Just in respect of bin wagon: No depot in Mildenhall or BM, unlikely to be tipping at a council centre, even less likely to be tipping at a council site at that time.
Biffa work on a dial collection basis, so it seems possible he Greggs or who ever manager just called up at the end of the shift and the collection was added to the route.
All of of this being said, I now think bin lorry only contained the phone, thrown there by Corrie as he went AWOL with the support of his brother. Think about where he dog and car are now.....
In trying to find out more about rubbish collections, I stumbled across a satisfaction type site for Biffa customers - and based on everything there, highly doubt they could get Biffa to make any extra pickups at all (if indeed it was a Biffa bin, which it most likely was). They are not known for their timeliness with majority of customers complaining about constant missed pick ups and lack of response to calls for service.