Seems to depend on the driver's mood and the package size. I had one at the local sub post office recently, but I've collected loads from London West depot. Obviously not a problem for me as I drive a van past it every day :)
You can request delivery to your local post office for £1
If Parcel Force fail to deliver, I get a "red card" and it's left at the nearest PO.
Isn't that SOP?