A few hints from the inside....
This is posted anonymously as i am about to call my workmates a bunch of lazy sods, and suggest something very fraudulent that would seriously cut down the profits if it was used too much....
If a special is put through the door without any signature being asked for, complain straight off, within the day if possible, before the hard copy of the signing sheet gets filed. (you could also claim that it was never delivered, the burden of proof is on them to produce a signature on a card, however I cannot suggest that due to illegality)
Almost all the postmen will be back by 3:00, and most of the packets will be filed by 4:00, so you can generally pick a packet up in the evening. (may not be possible for very large or heavy ones as these are done by van when one of the posties from an earlier round is free). however make sure to get there well before the closing time, on the dot of 17:30 (12:30 on weekends), the door will be closed, the main person on the desk is rarely given overtime, and i have witnessed him physically dive through the oversize parcels hatch and close the door as someone was walking up to it.
The person on the desk wants to get rid of you, if you can see the trolley of that days returns and ask him to have a quick check, it is easier for him to do that than to go and get a manager.
If you get a red card, MAKE SURE YOU HAVE IT!! you cannot be given anything without one without the express permission of a manager, and it generally takes ages to find one (the delivery office is a big place). If you do not get a card, you are pretty screwed unfortunately, for some reason we are not allowed to hand it over even with proof of address, although you may be a bit luckier with normal packets than specials/recordeds, if possible say that the card is unusable (went through wash (which is rather messy by the way) etc) rather than didn't turn up at all.
Your postman is lazy, put a note up telling him to put the packet through the catflap and he will, if you have one of those wall mounted post boxes, an amazon DVD pack will often fit in without enough sticking out for it to be removed.
Also, come in to collect stuff on a Saturday, if the caller's counter is busy then I can generally get put there rather than having to do a round, which is considerably easier. during the week there are enough other people that i don't tend to get in...
As a final note, anything with a return address is returned after 2 weeks, so if you really cant stand it, then just wait for the person you ordered it from to get it back.
Also i don't give a damn about the strike, only got 6 months left on my contract, so would not get enough cash from it to be worth it. I will be going in so that any further reference that I need from them looks good though