It sounds like this is a shared password, linked to the location not to individual users. This means this is automatically a fail. I can imagine how this went at design phase :
"We can just use a standard access credential for now. Staff won't remember their passwords and we will be constantly be asked to reset passwords..."
Individual user passwords. Or a physical access key of some description. There is no other sensible way. Being asked to remember several passwords for your job - this isn't rocket science and is a prerequisite for this 'Brave New World' we inhabit.
More inconvenient? Hell yes. But the other option is open to easy abuse. Kudos to your other reader for bringing this to Argos's attention...oh and The Reg for being courteous enough to not publish this until Argos changed their passwords...