In reply to mypyrex: I picked up one of my ebay orders yesterday from Argos. Delivery was exactly as stated and within the timescale given.
The important thing is to have the email/text before attempting to pick up, then its hassle free.
No email or text saying that the item is ready for pick up, don't bother trying.
Just for interest:
An arse tried to pick up an item at the store where my daughter works under the click and collect system. He had no mail confirming it had arrived but caused a load of hassle and was outstandingly rude. The store is just a drop off point, nothing more. Needless to say they couldn't give him his order as they didn't have it. He came in the next day with his email on his phone confirming that he could pick up and was given his item as it had arrived that morning. No apology, nothing.