It's quite a long way from our gates to the house so I'd been thinking of buying a parcelbox (like this one
- put a hinged sloping (thanks Colin) lid on the column and connect it to a hinged internal plate (parcel goes onto plate, lid shuts and parcel drops down below plate) - but that means the weight of the parcel will tend to pull the lid down and may cause injury
- simply have a slot on the front, with a hinged cover, and make sure the column is tall enough to prevent someone reaching in, perhaps some small sprung flap to discourage attempts
- some sort of hinged hopper/bucket as are used in charity donation bins ... a bottom-hinged door is attached to a hopper/tray so that when the door is open the hopper blocks access to the inside of the bin, when the door shuts the contents of the hopper drop down - slightly tricky to make, but may be the best answer.
All suggestions gratefully received.