Just a head's up that two of my neighbours have recently had foodstuffs stolen from their doorsteps: milk and eggs from Waldeck Road, and a whole veg box from Langham Road. Not much you can do about the early morning milk I guess, unless you stand guard all night, but for bigger deliveries, perhaps worth instructing drivers to leave things in an especially well-concealed place.
I had to give up getting milk from the milkman because not only was the milk getting nicked but so was the cash I left in various places to pay for it!